Nforce4 mobo causing hard disk failure?

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Hope someone can help with this.
I bought a Biostar Nforce4 socket 939 motherboard a couple of years ago which mostly worked ok until the last few months.
The only problem I had with it was strange reboots/crashes where it would be like pressing the hard reset button.

Recently, it's been causing the main hard disk (Raptor 74GB) to fail during operation as if someone just pulled the power plug out of the drive.
After this, it won't recognise the drive in POST unless I leave the computer off for a few mins and try again.

I thought it was the hard disk failing so I bought a new one yesterday and reinstalled everything.
However, it's just done the same thing again and won't recognise the drive during POST.

Sometimes it does, then gets into Windows and loses it a few mins after.
I can tell when this happens because Windows will stop responding - I can still move the mouse and stuff but anything that needs disk operation won't work.

Sometimes when I try to turn the PC on again it won't react to the power switch being pressed for a while.

What can be causing this?
I have a few theories:
BIOS problem, ACPI malfunction, IDE/SATA controller malfunction, capacitor failure, PSU failure.

I've looked at the capacitors on the mobo and none show signs of bulging or leaking but it's weird that this problem has only just started happening in the last couple of months.

Thanks for any advice.
 
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iirc main causes of corruption were down to software, nvidia ide drivers and firewall (well, sorta software :P).

I don't think the chipset had any specific issues.

Obvious I know but I'd check the cables / wires from the PSU that you are using to connect the drive, check for errors in event viewer and replace the SATA cable.

PC on again it won't react to the power switch being pressed for a while
What is the PSU?
 
Really weird this...
I just booted it up into Windows (writing this on spare PC) and it was detecting the hard disk ok but not the DVD drive.
It locked up as usual after a minute but now when in POST it's detecting the DVD drive and not the hard disk.
 
Right, I've run Memtest from a CD and it passed with no errors.

Also I've done this:

Changed SATA cable & port it was using
Used a different power line from the PSU with a molex > SATA power adaptor.
Checked event viewer - no errors relating to hard disks or anything like that.

Is it possible that the caps on the mobo are failing and are not showing any physical signs yet?
That's what I'm thinking it is, or it could be the BIOS acting weird due to being a revision 1.0 motherboard which I bought when NF4/PCI Express was all brand new.
Or it could be a faulty SATA/IDE controller? I have no idea if these things happen like this or if they just stop all of a sudden or sometimes work and sometimes not?

If it was the PSU failing, then surely the fans would stop as well? Or the graphics card etc? It's only the disks I'm having problems with.
 
I'd say with 99% certainty your problem is the PSU. The HDD or DVD not being detected is a clear sign of it. Swap out your graphics card for a cheap low power usage card and it'll likely run perfectly.

PSUs lose power over time and yours has likely reached the point where it can't power your system anymore.
 
Hmm ok, that makes sense I guess.
I plan to replace it anyway - I was using a nice OCZ 550W unit but that died on me so started using a cheap one.

Thanks for the advice :)
 
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