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11-09-2004, 09:16 PM
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#1 |
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Stereo junkie
Join Date: Jan 2004
Location: Just North of Fort Pontchartrain du Détroit
Posts: 3,402
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OK gimme a hand here
well...i rebuilt the NF7-S system today, and i planned on giving it to my brother. the build went nice and smooth and took me about 1/2 hour initially. next, i push the start button, it comes on for a split second then dies
 . next thing, i take it out of the case, put it on a piece of plywood, inserted memory, CPU, HS, and video card. i made sure the CPU fan wasnt connected to a fan header...i hooked it straight to the PSU. i hit the power button....same thing....quick start and instant shutdown. i checked the motherboard closely for shorts and whatnot and didnt come up with anything. it was working great before i switched to the DFI. i tried different PSUs, different CPUs, and different memory and it still did the same thing. any ideas .
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11-09-2004, 09:39 PM
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#2 |
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Member (10 bit)
Join Date: Dec 2003
Posts: 590
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Does the motherboard led come on for the few second the power supply turns on?
I just recently hooked up a pow max pos to a motherboard and the case cathodes and fans to test if all the fans lit up so i knew i could keep the case (it'll be a little while before i put something in it). Took 4 tries before the power supply decided to really wake up. Each failed try the psu fan would start moving, motherboard led turned on.. then the psu would just quietly die off. I know from a previous build that soemthing about "circuits" of a motherboard (forget what was actually said) sometimes fail to work initially after a long dormant period. During that build I couldnt get the psu to stay on either, but it magically worked a few days later after i tried several things. Someone told me the power cycling simply brought the motherboard back to life. Guess if this is true it could easily apply to new motherboards. If your motherboard is actualyl getting power (led goes on) try just power cycling a few more times. Id wait a minute or two before boots. If that doesn't work... Try taking everything out, simply leave the psu plugged into the motherboard and remove all other components. Plug a case fan in, or the heatsink fan in only. Power up and see if the psu stays on that way. |
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11-09-2004, 09:52 PM
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#3 |
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Stereo junkie
Join Date: Jan 2004
Location: Just North of Fort Pontchartrain du Détroit
Posts: 3,402
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ive tried all of that before...but the cycling. that sounds interesting and i may give it a try. i would like to hear the opinions of others before i try it though
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11-09-2004, 09:52 PM
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#4 |
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Got Privilege?
Join Date: Jun 2001
Location: IA go Hawks
Posts: 1,257
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Quadruple check how the power switch is hooked up.
It sounds like what happens when you switch on the PSU and the MB switch is in the off posistion.
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11-09-2004, 10:13 PM
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#5 |
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Served with Pride
Staff
Premium Member
Join Date: Apr 2003
Location: near the left coast of Michigan
Posts: 14,565
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Hey TC, I think you have to plug the cpu fan in the cpu fan connector in order for the mobo to fire up. You mention having it connected directly to the psu. Think the mobo has to recognize a running fan.
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11-09-2004, 10:40 PM
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#6 |
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Member (10 bit)
Join Date: Dec 2003
Posts: 590
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His might need the cpu fan plugged in if thats something special about Abit mobo's (wish I owned a couple of their boards). I know Dell, Compaq and Asus don't. I just tested that last board I mentioned (asus A8V) with nothing but 2 case fans, the power switch and the cathode led plugged in.
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11-09-2004, 11:23 PM
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#7 |
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Member (9 bit)
Join Date: Nov 2003
Location: Milwaukee, WI
Posts: 258
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well not that I dont think you've covered this already...but..
have you plugged in the 4 wire ATX12Volt wire from PSU? have you plugged in the 3 wire CPU fan header from HSF? cleared the C-mos? |
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11-10-2004, 04:57 AM
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#8 |
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Member (12 bit)
Join Date: Oct 2003
Location: Manchester, UK
Posts: 2,374
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This sounds like a power supply problem to me, but as you said no power supply will work. That doesn't exclude a problem with power though. Have you checked the ATX connector on the motherboard is ok? No dirt, blockages, etc? Its just this is what could happen when the motherboard doesn't get the power good signal from the PSU, it can't boot without the signal.
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11-10-2004, 06:59 AM
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#9 |
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Stereo junkie
Join Date: Jan 2004
Location: Just North of Fort Pontchartrain du Détroit
Posts: 3,402
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ok...new developments. if i remove the BIOS chip or the CPU, the board starts up
. im wondering if there is any way to disassemble the ZIF itself, as i think i may have had a small piece of copper wire embedded in the socket somehow from my L12 mod. does anybody know if a ZIF can be disassembled? id like to take it apart and see if there is anything in there.
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11-10-2004, 07:13 AM
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#10 |
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Member (12 bit)
Join Date: Oct 2003
Location: Manchester, UK
Posts: 2,374
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11-10-2004, 11:41 AM
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#11 |
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Stereo junkie
Join Date: Jan 2004
Location: Just North of Fort Pontchartrain du Détroit
Posts: 3,402
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excellent posdt ric. youve helped me out a great deal
. now i just have to wait until i get home from work to get that bad boy apart. thanks again.
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