computer shuts down help needed

[RobTi]

HI
Posting this on behalf of my sister, she had to get a new psu about 4 weeks ago now tonight she cant get anything to load every time its switched on it goes to the recovery screen with the prompt to select last know good configuration, i have tried that option also normal and safe mode all she gets is a couple of seconds of it loading then it switches off.
Tried all accessories unplugged just monitor and keyboard\mouse connected but still the same result.
Any ideas?
Thanks
Robert

[Koolpc]

When i have seen this happen a fresh install of windows has been required!

[RobTi]

When i have seen this happen a fresh install of windows has been required!

Thought that but found out its an acer with no system disc just the files on-board for a re-install and she didn't burn these to disc to make a back up.
Any ideas btw its xp she was running?
Thanks
Robert

[Koolpc]

What version of XP?

[RobTi]

Thanks for all the help people, had to take a drive up to see it today found out right away when i heard the cpu fan ramp up to full when booting, turns out 3 of the mounting brackets had broken so cpu overheat protection was kicking in , held the cooler onto the cpu and booted fine.
So a new cooler needed
Thanks
Robert