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newly built computer shuts on then off within seconds!

by MZRANDuM / November 2, 2010 6:47 AM PDT

SPECS:
ASUS-M4A785-M
onboard graphics card, but if computer didn?t boot I was going to try using [BFG Tech]GEFORCE 7950 GT OC
AMD Athlon II quad core
4 x 1gb DDR2
650W blustar PSU
*Everything is new, the only thing that is used is the graphics card*


I just put together this new computer. I haven't even put an OS in it yet. I turned on the computer and everything was working so smoothly for about 30 minutes, then out of nowhere it turned off. When I tried turning it back on the fans and led lights would turn on for about 1-2 seconds then shuts off (so basically everything turns on then off within seconds) it won?t stay on, however when I have the PSU on the little green LED light on my motherboard stays on and as soon as I turn off the PSU the motherboard's LED light will go out so I don't think it's the motherboard but I could be wrong. Everything is compatible with the motherboard I've checked thoroughly. I also took the motherboard out of the case and looked for any dark marks I also smelled it, and see no signs of the motherboard being burned out. I double checked all wiring and hardware components and tried it, still the same.
UPDATE:I tried turning it back on but the fans and led lights are not turning on at all.but the little green LED on the motherboard is still working fine. HELP PLEASE .

Any help will be greatly appreciated

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Two Things I'd Start With..
by Grif Thomas Forum moderator / November 2, 2010 7:15 AM PDT

1. Make sure the thermal grease is applied correctly and the heatsink and processor are attached as designed.

2. Swap in a known good power supply.. Although you're current one may be new, it appears like it could be the culprit.

Hope this helps.

Grif

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reply
by MZRANDuM / November 2, 2010 7:51 AM PDT

the thermal grease was already applied when i bought the cpu, and the power supply is new i have another one that is 550 watts i tried that one too but my computer still does the same thing

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Then We Start From Scratch..
by Grif Thomas Forum moderator / November 2, 2010 8:18 AM PDT
In reply to: reply

Troubleshoot the issue.. Remove the cpu and reapply the thermal grease and reseat the heatsink, etc. Remove all RAM sticks except one, in the number one slot, then remove the graphics card, then start the machine.. Do things appear to start correctly now? If so, then place the graphics card in the slot and try again. Continue on determining exactly which part is the culprit.

If it's not running correctly without the graphics card, then the motherboard, or your power supply's connections to it are not functioning correctly.

Hope this helps.

Grif

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RE::
by MZRANDuM / November 2, 2010 12:13 PM PDT

I think i found out what the problem is,i looked at M4A785-M Memory Qualified Vendors List and seen that the lowest i can go is 667MHz the ram i have is 533MHz the funny thing is that i asked my bf if this ram was ok before i bought it and he said it was,but i guess he was mistaken so now i'm going to buy new ram and see how that works.I still don't understand if that is the case why the computer turned on and stayed on for 30 minutes before it decided to turn off...anywho i have my fingers crossed

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