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Discussion Starter #1
My friend just bought a new VGA (MSI NX7900GTO 512MB DD3), a cpu cooler (Zalman 9500) and a new PSU (OCZ 700W Gamers Edition)... his setup now includes:<br />
<br />
CPU - AMD Athlon 4800+ X2<br />
Mobo - Asus A8N-SLI<br />
1GB - Amp-X Ram<br />
VGA - MSI NX7900GTO 512MBDDR3<br />
CPU cooler - Zalman 9500<br />
PSU - OCZ 700W Gamers Edition<br />
300GB Sata3 Hardisk and Thermaltake Shark and 2 DVD-Writers<br />
<br />
I assembled the system together, when i switced on the PC, it turned off again immediatly, i tried to switch it on again but nothin. I re-checked all cablings but still no answer. then i took out the 12V 4-pin cpu1 rail from the mobo and it turned on but no boot up, the fans just turned on... when i plyg the 12V 4-pin cpu rail into the mobo, the pc wont even boot.<br />
<br />
I appreciate all the help<br />
<br />
Cheers
 

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If it did turn on for just a couple seconds and then power off... I'd start w/ the heatsink. Ensure that the zalman is securely locked down to the cpu. I've had heatsinks ride just a hair above the cpu causing it to overheat very very quickly. It then turns off and won't fire back up till the bios is cleared. <br />
<br />
Next, i'd remove everything except:<br />
Mobo<br />
CPU<br />
1 stick or RAM<br />
Video card<br />
<br />
If you can't even get it to power on, I'd remove the battery in the mobo, cut power to it (either thru a PSU switch or just yank the plug) and then hit the power button a few times to drain any remaining power to the board. Let it sit for about 15 minutes. Plug everythign back in and try again.
 

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Discussion Starter #3
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Originally Posted by <strong>willhoy</strong>
<a href="showthread.php?s=f0ff622456a527c34b14aeab359ee59d&p=1391827#post1391827" rel="nofollow"><img class="inlineimg" src="http://static.overclock.net//img/forum/go_quote.gif" border="0" alt="View Post" /></a>
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<div style="font-style:italic">If it did turn on for just a couple seconds and then power off... I'd start w/ the heatsink. Ensure that the zalman is securely locked down to the cpu. I've had heatsinks ride just a hair above the cpu causing it to overheat very very quickly. It then turns off and won't fire back up till the bios is cleared. <br />
<br />
Next, i'd remove everything except:<br />
Mobo<br />
CPU<br />
1 stick or RAM<br />
Video card<br />
<br />
If you can't even get it to power on, I'd remove the battery in the mobo, cut power to it (either thru a PSU switch or just yank the plug) and then hit the power button a few times to drain any remaining power to the board. Let it sit for about 15 minutes. Plug everythign back in and try again.</div>

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Ill try all these nxt morning as its late here. thanks alot, ill let you know
 

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Discussion Starter #4
Back from trying to solve the issue.<br />
<br />
I did what willhoy recommended what no success, after doing so i dismantled some parts of my pc, the CPU and the PSU and connect these parts with the mobo instead, but still with now success.<br />
<br />
let me point out -> when i connect the 4-pin 12V connector which is usually found next to the CPU the PC wont switch on, as if its totally dead, but when I dont connect this, the PC does turn on (at least the fans do) but no boot up on the screen whatsoever. Other ideas appreciated. Could be the board got screwed?
 

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Try a different power supply, I've had a few brand new ones that would do something similar. It was weird because if I hooked them up to a different system they would work fine. Shouldn't have been an issue with powering things, they just simply didn't want to work.
 

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Check the pinout locations on the 4 pin in the link, pg 34 just to be sure they are correct. Also, with the 20/24 pin disconnected, if you have a multi meter, you can cold jump start it by jumping the 20/24 pin pwr_on (pin # *) to a common (ground) wire and see if the 4 pin is out putting the correct voltages. <br />
<a href="http://www.formfactors.org/developer/specs/ATX12V%20PSDG2.01.pdf" target="_blank">http://www.formfactors.org/developer...20PSDG2.01.pdf</a>
 

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Discussion Starter #7
I've tried 3 other PSU, including his old working one and my Hiper Power Type-R, all no no success. I ran out of ideas and concluded that the motherboard is fried...
 

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sounds like your motherboard is shorting out, or the ram is incorrect for that motherboard (ddr2 on a ddr motherboard), i've had both of these happen to me and do that
 

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Discussion Starter #10
tried all the suggestions, to no success, my friend ended up buying a new board (exactly the same) and i re-built it on the new one and everything worked fine.
 
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