XP Pro SP2 wont warm boot

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Hi guys,

I'm pulling my hair out on this one.
Windows XP Pro SP2 and all updates; Gigabyte GA-81TXR with P4 2 gigger and
512Mb Ram

My system just wont do a restart at all. It gets as far as the black screen
between Windows is starting and the Welcome screen and it just hangs. The
mouse pointer is very jerky and eventually stops moving.
It even locks up at the same point when I exit the BIOS to Windows.
I've searched the MSKB and found nothing to help. I've checked and rechecked
all the BIOS settings. I've disabled all the resident software (Anti-virus,
Firewall etc) one by one but nothing helps.
All hardware has the current drivers.
Reg Mechanic and Sytem Mechanic don't report anything.
Norton Antivirus and Firewall, Pest Patrol,Spybot and AdAware don't report
anything.

I don't remember exactly when this all began, but it's certainly been quite
a few weeks now.

About the only thing I haven't done is to do a re-install over the top
(yet).

I am wondering if this could be a PSU problem? I have 3 HDD's and a DVD
drive, a Firewire card, a USB2 card and internal hub and an internal multi
card reader. These last 2 both take power direct from the PSU. Is all this
too much for my 300watt PSU?

Cold boots are not a problem at all, just warm reboots and restarts.


.

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