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Bios resets, now OC hangs

CheesePoofs

Diamond Member
My friend has this computer:

A64 3500+ Winchester (stock cooling)
Gigabyte GA-K8N-Ultra9 (nforce 4 ultra chipset)
2x512 Kingston HyperX (PC3200, 2-3-2-x)
BFG 6800GT OC
420w OCZ Powerstream
250gb maxtor sata
80gb maxtor pata

He had his computer OC'd to 2475mhz (225*11 @ 1.55v, ram at 166 divider=187mhz). It was prime and memtest stable. I had him change his OC to 247*10 @ 1.55vram at 166 divider = 206mhz. He had to raise the ram volts +.2v (the max for the board) to make it boot windows, and even like this it failed memtest after 7 hours.

He was running prime95 to make sure it was stable, and then decided to reboot so he could put in his 80gb maxtor pata HD that I had been borrowing from him. He put it in, rebooted, and the comp freaked out. It turned out that his bios got reset. He originally had the hard drive set for slave even though it was on its on cable, but I dont think that has anything to do with it.

I had him set all his settings back to what they were (the 247*10 OC) and it hung on the detecting IDE drives screen. He was eventually able to get into the bios, and he changed the settings back to the other OC (225*11) and it did the same thing. So now all his settings are back to stock, and the computer is booting fine, although he hasn't run prime 95 yet.

This is all coming to me from my friend, so it could be something obvious that he missed, but I dont' really think it is.


Cliff notes:
*Had comp OC'd to 2475mhz, was stable
*Added another HD (was jumpered incorrectly), bios reset, now the OC hangs on detecting IDE screen
*WHen set back to stock settings, boots fine.

Any ideas as to what caused the bios to reset or why the OC's arent' working anymore?

Edit: New info: The computer wouldnt' boot until he disabled all raid functions, with them enabled it kept going into the raid setup page.
 
Remove the HDD and see what happens?

I assume the PCI/AGP freq. are locked.

I have had Maxtor drives flip out at a higher PCI freq.
 
He tried removing the HD right after the bios had reset, meaning it was running at stock speeds, and it gave him a checksum error. This error went away when he loaded the optimized defaults in the bios.

I'm going to have him try and remove the HD and OC the computer again tomorrow.
 
He hasn't removed the HD and tried that, but the board's bios reset again on him today. he's running all stock settings. Any idea what could cause this?

As a side note, the chipset cooler (its an nforce 4 ultra chipset) is a passive copper heatsink that gets very hot to the touch. Could this have anything to do with the bios resetting?
 
Motherboard intermittently short circuiting on something? A dropped screw? Maybe even a bad IDE cable. You never know.

Other than that possibility, I'd also immediately suspect the drive.
 
Well, he finally got around to pulling the hard drive, and now he can overclock to the same settings he was at before.

So I guess its a bad IDE cable?
 
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