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08-16-2008, 02:44 PM
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#1 |
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Member (6 bit)
Join Date: Jun 2008
Posts: 33
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Momentary Power
Hello,
I assembled a new PC today, and everything was going great until I tried to turn the power on. I turned it on once, but stopped it when I heard a grinding noise coming from the fan. I turned it on again to determine which fan it was. I opened it up, stopped the fan from flicking a wire, and tried to turn the computer on again. Runs for an instant before shutting off. Checked connections, tried again. Nothing. I went to the stickied thread and followed the instructions to set up the motherboard out of the box and tried to turn it on with a screwdriver. Nothing. I popped out the CPU, examined it and the motherboard's pins. Everything looks great. Reseat the CPU, put it all back together, try to start it with the screwdriver again. It runs for about half a second before turning off again. Now I can't even get it to do that. What should I do? PC Power and Cooling Power Supply ASUS P5Q Pro Mobo G-Skill 2 x 2GB RAM Q6600 Quad CPU ASUS HD 4850 Vid Card |
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08-16-2008, 02:49 PM
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#2 |
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I like me
Join Date: May 2007
Location: Tejas
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Do you have both the power supply cables plugged in?
Is the mb on cardboard?
__________________
It's coming....just you wait. |
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08-16-2008, 02:51 PM
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#3 |
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Member (6 bit)
Join Date: Jun 2008
Posts: 33
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The 8-Pin CPU plug is plugged in, the 24-Pin mobo plug is plugged in, and the 6-Pin Vid Card plug is plugged in. The mobo is on top of a sheet of cardboard.
Oh, and the power indicator LED is lit on the mobo when I turn the power supply on. |
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08-16-2008, 03:09 PM
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#4 |
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I like me
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Do you have spare parts that you can substitute with?
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08-16-2008, 03:13 PM
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#5 |
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Member (6 bit)
Join Date: Jun 2008
Posts: 33
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Unfortunately, no, my other computer is a laptop.
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08-16-2008, 03:47 PM
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#6 |
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I like me
Join Date: May 2007
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Are you using the retail heatsink?
Are all 4 pins in completely? Did you put any thermal paste on it? |
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08-16-2008, 03:58 PM
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#7 |
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Member (6 bit)
Join Date: Jun 2008
Posts: 33
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The first time I was using a Xigmatek heat sink that was extremely difficult to install, but I am sure I managed to get all the pins in place. I used Arctic Silver 5 thermal compound. I messed up installing the heat sink the first time, but I made sure to clean all the AS5 properly before reinstalling it.
This time I used the stock heatsink that was far easier to install, and I just used the thermal compound that was already on the bottom of the heat sink. All 4 pins are properly seated. |
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08-16-2008, 04:00 PM
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#8 |
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I like me
Join Date: May 2007
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How many watts is your power supply?
Well, I'm going to take a guess and say it's either the motherboard, or powersupply. I would probably try rma'ing the motherboard first. |
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08-16-2008, 04:06 PM
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#9 |
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Member (6 bit)
Join Date: Jun 2008
Posts: 33
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Power supply is 610 Watts.
Well, fingers crossed that it is the motherboard, I'd hate to have to RMA a bunch of components until I figure it out... I will note this though, when I was putting in the CPU, and after I made sure it was fully seated, when I put the cover and ZIF lever down, there was a grinding/scraping noise that I wasn't prepared for, and when I looked at the CPU later, there were small indentations that the pins made on the contacts on the CPU. That didn't really seem that unusual to me, and none of the pins on the socket were visibly bent. Is this sound normal? Last edited by Cultist_3; 08-16-2008 at 04:14 PM. |
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08-16-2008, 04:16 PM
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#10 |
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I like me
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Are you sure you put the cpu in the right way?
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08-16-2008, 04:44 PM
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#11 |
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Member (6 bit)
Join Date: Jun 2008
Posts: 33
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I checked as I was dismantling the mobo. I am positive I put the CPU in the right way.
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08-16-2008, 04:57 PM
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#12 |
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I like me
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Ok. Let's try one more thing.
Ty to power it on with just the motherboard, cpu, heatsink, and power supply. If not, then it's time to send either the psu, or mb back. |
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08-16-2008, 06:01 PM
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#13 |
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Member (6 bit)
Join Date: Jun 2008
Posts: 33
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Big fat dud.
I'm going to RMA the mobo and see what happens. I'm REALLY hoping it's the mobo and not the power supply because I bought the ps a few months ago, didn't really test it, and sent in the mail in rebate already, so I wouldn't be able to get it replaced. After reading the reviews for the power supply, I figured that there would be a pretty much nil chance of a dud. The reviews for the motherboard could be better though, so I'm more inclined to believe it's the mobo. For reference: ASUS P5Q Pro LGA 775 Intel P45 ATX Intel Motherboard http://www.newegg.com/Product/Produc...82E16813131299 PC Power & Cooling S61EPS 610W Continuous @ 40°C EPS12V Power Supply http://www.newegg.com/Product/Produc...82E16817703005 I'll update this with results after I get the new mobo. Thanks for the help so far 
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08-16-2008, 06:02 PM
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#14 |
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I like me
Join Date: May 2007
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Keep us posted to what happens with the new motherboard.
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08-28-2008, 06:24 PM
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#15 |
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Member (6 bit)
Join Date: Jun 2008
Posts: 33
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Alright. New motherboard. Same problem. Guess I should try and replace the power supply next.
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08-28-2008, 07:32 PM
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#16 |
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Member (9 bit)
Join Date: Aug 2007
Location: England
Posts: 324
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Are you sure it's not the CPU? My guess would be that it could be overheating excessively quickly and its turning the computer off. You then completely burnt it out after you kept turning it on? Just airing my thoughts, I didn't think you could turn a computer on, even to the BIOS without a CPU.
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08-29-2008, 12:41 PM
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#17 |
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Member (6 bit)
Join Date: Jun 2008
Posts: 33
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Well, the first time I turned it off myself to fix a fan issue. The times after that are when it turned off on its own. After a lot of screwing around, I was able to get it to start up one last time for about a quarter of a second. If I had fried the processor, wouldn't it not start at all? After the new motherboard it wouldn't start at all, but considering its previous behavior... I don't know, I might just end up taking it to a shop and have them diagnose it for me.
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08-29-2008, 03:56 PM
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#18 |
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Member (8 bit)
Join Date: Mar 2006
Posts: 241
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Modern Intel processors have thermal shutdown circuitry so it's highly unlikely that the CPU is cooked. The system started the first time then had trouble the second when the only thing that changed between was moving a wire that was interfering with a fan. This suggests either power supply or motherboard, and since you've replaced the motherboard you're left with the power supply. (If you've got even one stick of memory in there, try taking it out just in case it somehow shorted and is taking down the power supply.)
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09-05-2008, 01:02 PM
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#19 |
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Member (6 bit)
Join Date: Jun 2008
Posts: 33
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Well, I caved and took it to a computer shop, and they said it was the power supply.
I'm definitely glad I took it there, because I was going to RMA the processor next simply because I could still have RMA'd it. I bought the PS months ago. I already bought a new PS, CORSAIR CMPSU-650TX 650W ATX12V / EPS12V SLI Ready CrossFire Ready 80 PLUS Certified Active PFC Power Supply http://www.newegg.com/Product/Produc...82E16817139005 Here's hoping the new one does better than the old one. |
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09-05-2008, 02:20 PM
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#20 |
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I like me
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You can probably try to contact the psu maker, and see what their warrenty is like.
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09-06-2008, 03:10 PM
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#21 |
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Member (12 bit)
Join Date: Jul 2002
Location: Illinois
Posts: 3,557
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The PSU should be under warranty even after send in in the rebate. That would just disqualify you from obtaining another rebate on the replacement.
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