HP Pavilion 533w, Windows XP Pro SP3, IE 8.1 and Mozilla Firefox 3.1 Beta. Under BIOS window, pc runs forever. However, once Windows starts the pc goes into a "sleep mode" that includes: yellow power indicator light (instead of green), keyboard Num lock, Caps lock, and Scroll lock lights all come on but keyboard won't function, CPU fans remain on, monitor loses signal.
Attempt to boot the machine in
Safe-Mode.
While powering up continuously hit F8.
You will get a Boot Option Menu, Select Safe-Mode boot
If you can get into safe-mode I would suggest to try doing an online
scan, as it sounds like your issue could be related to malware:
www.trendmicro.com/housecall
Let us know
Good luck
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