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03-02-2006, 08:19 PM
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#1 |
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Member (9 bit)
Join Date: Jun 2004
Location: Dixon, Illinois
Posts: 318
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Unknown problem
Not sure exactly what is wrong with a friends' computer. I had issues where the computer would try and power up as soon as the power cable to the power supply was inserted, without pressing the power switch. Apparently his dog had gotten behind the computer and yanked on the video cable to the monitor and after that, the computer wouldn't boot. When I got it, the board had a small crack on it where the onboard video connects so we put a new motherboard in.
I followed HAL's thread on building the computer outside the case to make sure that the motherboard wasn't shorting out and it is still having the same issue. When you press the power button to start it up, the power light comes on, but there is no video, it stays on for a few seconds, and then it powers down. The computer is a DELL and that's about all I know about it. I tried a different stick of RAM and that didn't help either. I'm beginning to think the CPU is fried. Any suggestions? Scomac |
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03-02-2006, 11:57 PM
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#2 |
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Member (14 bit)
Join Date: Mar 1999
Location: Christmas, Florida
Posts: 10,654
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really not enough info :
what cpu is it ? did you use the same cpu that was in the old motherboard ? did you clean off the old thermal paste / pad and install some new paste ? do you get any beeps at all ? make double sure the ram and vid card is inserted all the way. what is the new motherboard / same make and model as the old one ? |
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03-03-2006, 06:37 AM
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#3 |
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Member (9 bit)
Join Date: Jun 2004
Location: Dixon, Illinois
Posts: 318
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Intel Celeron 2.4, original CPU.
Yes, thermal paste is OK No beeps- no speaker No video card-onboard RAM ok-reseated and tried new motherboards are identical Scomac |
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03-03-2006, 07:13 AM
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#4 |
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Member (8 bit)
Join Date: Jan 2006
Location: Nova Scotia, Canada
Posts: 183
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Make sure if the board has a 12 Volt Power Connector (4 Pin) That it's connected as well as your 20 Pin Power Connector. Some Dell's even use the legacy 6 Pin Power Connector. Only connect your CPU, Board and Memory with your Power Switch connector of course. Make sure your CPU Fan is plugged in to the proper connector (CPU_Fan not CHAS_FAN or AUX_FAN). Keep posting as much information and observations as you can.
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03-03-2006, 01:44 PM
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#5 |
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Member (9 bit)
Join Date: Jun 2004
Location: Dixon, Illinois
Posts: 318
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Power supply 4 pin 12volt is connected as is the cpu fan. There is no 6 pin connector. As soon as the power supply is plugged into the wall, the PSU fan and the CPU fan run without the power button being pushed. When the power switch is pressed, the power light comes on for about 20 seconds and then shuts off. The PSU and CPU fan stay on. The only thing that is connected is the PSU, 1 stick RAM, the motherboard power connectors, and the CPU fan.
One thing I did notice, is when the power supply is plugged into the wall without being plugged into the MB, the PSU fan does not run. As soon as the PSU is plugged into the board, and then you plug the PSU in, the PSU fan turns on with or without the Power switch being connected. The MB he got from DELL was refurbished...Could the refurbished MB be bad? Scomac |
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03-03-2006, 04:44 PM
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#6 |
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Forum Administrator
Staff
Premium Member
Join Date: May 2000
Location: Joplin MO
Posts: 36,460
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Yep. You probably have a bad motherboard on your hands there. It should not start till you short the power switch pins momentarily. I have seen boards where the thing starts momentarily when you plug them in, but they shut back off in less than 1 second.
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03-03-2006, 05:02 PM
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#7 |
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Member (9 bit)
Join Date: Jun 2004
Location: Dixon, Illinois
Posts: 318
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So, the refurbished board that he got as a replacement from DELL is probably bad as well?
Scomac |
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03-04-2006, 03:04 PM
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#8 |
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Forum Administrator
Staff
Premium Member
Join Date: May 2000
Location: Joplin MO
Posts: 36,460
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Is this happening with the board out of the case and on the table? Only ram, cpu, and PSU hooked up (Not the monitor or keyboard..........)?
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03-05-2006, 07:59 AM
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#9 |
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Member (9 bit)
Join Date: Jun 2004
Location: Dixon, Illinois
Posts: 318
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Yes. I did this with both the old board and the new (refurbished) board. Built them outside the case on a wooden table. Only hooked up PSU, CPU & fan, and 1 stick RAM, and the monitor and the power switch. No internal speaker for POST beeps.
Scomac |
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03-05-2006, 10:21 AM
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#10 |
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Shiro Usagi
Premium Member
Join Date: Sep 1999
Location: Kaneohe, Hawaii
Posts: 34,002
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Did you try another compatible power supply in there yet?
 Cricket
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03-05-2006, 07:17 PM
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#11 |
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Member (9 bit)
Join Date: Jun 2004
Location: Dixon, Illinois
Posts: 318
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Yes, I tried with another PSU that I know is good.
Scomac |
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03-06-2006, 09:16 AM
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#12 |
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Shiro Usagi
Premium Member
Join Date: Sep 1999
Location: Kaneohe, Hawaii
Posts: 34,002
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Then it sounds like the motherboard is to blame.
Cricket
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03-06-2006, 03:04 PM
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#13 |
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Member (9 bit)
Join Date: Jun 2004
Location: Dixon, Illinois
Posts: 318
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Then I'll give the refurbished motherboard back to him to get an RMA from Dell, and hopefully they can send another new motherboard. So, you don't think the CPU is fried?
Thanks for all the help everyone! Scomac |
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