Computer wont get past post screen when restarted

lilmanmgf

Junior Member
Dec 31, 2007
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Here is a strange bug that I have recently been experiencing. I have a 939 3700+ in an Asus A8N-E motherboard. I just picked up a new cooler master case which has the power supply mounted on the bottom of the case. Sadly the P4 connector on my antec psu cannot reach the 4 pin slot on the motherboard. I had a random old adapter in which you plugged in a 20 pin atx bundle. On the output is a 20 pin atx connector and the 4 pin P4 connector. I plugged the P4 into the p4 slot, the 20 pin atx into the atx slot, and I used the 4 pins which are part of the psu's splitable atx bundle.

Okay, now the first thing I noticed was when I first turned on the computer in the new case the cmos had somehow reset. All of my bios settings were back to default, but I had not unplugged the onboard battery. I restored my old OC settings and everything was fine until the next morning. When I turned my computer on it hung on AMD Athlon 64 3700+. I couldn't enter the bios at all, it was frozen. After several restarts I gave up, turned off the power supply and disconnected the battery. After letting it sit a couple minutes and putting it back together I was able to get into the bios, bring everything back to normal and get into windows. I ran super pi for several hours, and played a couple games and it remained stable. That is until I restarted my computer. Once again it hung at the processor line.

An hour ago I ordered a P4 extender cable so I can use the true P4 connector which comes from the power supply. Do you think this will fix my issue, or is something else wrong. I just ordered a galaxy 8800gt the other day, so I hope I can get this resolved before it arrives.

I tried using the 12v line from the psu and I still get the same issue. No components have changed and yet now I am getting this problem. After I reset the cmos when it boots for the first time I get a cmos checksum error and I have to change some settings in the bios. Any ideas?


 

Atheus

Diamond Member
Jun 7, 2005
7,313
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So does your board expect a 24-pin connector and you're only giving it 20? Or is it just the auxillary connector which is abnormal? I couldn't quite follow what you've done, but the whole post made it sound like a clear PSU problem, until I read this:

After I reset the cmos when it boots for the first time I get a cmos checksum error and I have to change some settings in the bios.

Are you sure the battery is ok? Are you sure you haven't left the clear CMOS jumper in the 'clear' position?
 

lilmanmgf

Junior Member
Dec 31, 2007
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It could be the battery. I have both the 24pin atx and the 4 pin P4 connector right now. When I first made the swap into the new case my bios was reset, so it is possible that the battery is dead.

What I meant to say that after I pull out the battery and unplug the power supply to reset the bios, it will not restart after I reconnect everything. The clean default bios yields a checksum error, and I need to correct things in the bios.
 

mechBgon

Super Moderator<br>Elite Member
Oct 31, 1999
30,699
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Check to be certain that the 4-pin section of that extension is designed to provide you with an ATX12V plug (two 12-volt wires, two ground), and not to adapt a 20-pin into an ATX2.0 24-pin (one 12V, one 3.3V, one 5V, one ground). You wouldn't want to be supplying the incorrect voltages at the ATX12V receptacle.

After I reset the cmos when it boots for the first time I get a cmos checksum error and I have to change some settings in the bios. Any ideas?

That's normal behavior after clearing the CMOS, you're OK there.
 

lilmanmgf

Junior Member
Dec 31, 2007
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Okay. I replaced the battery and upgraded to a 550watt Antec NEO HE power supply, yet I am still getting this problem. Any other ideas? It doesn't matter whether I have the cpu at stock speeds or overclocked. If it is powered down for a while it hangs at the spot where its say:

Athlon A64 3700+

It does not perform the memory check and I cannot enter the bios. The computer is dead stable in games and super pi. Does anyone have any ideas?