Computer Fails to Start

I have a desktop system running XP, AMD Sempron. When I power up the system it appears to pass post, I get one beep, and sometimes make it to XP splash, then all of a sudden it shuts down. I have tried to go to safe mode, and even last known good. It gives the option and then again just shuts down for no apparent reason. I have also tried to swap power supplies which did not do any good either. Any suggestions are greatly appreciated!!
cctfstrategyAsked:
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nobusCommented:
if the system shuts down while in the bios, it is certainly no OS or software problem.
try to diagnose by disconnecting devices, or start with the minimum :
mobo + cpu + 1 ram stick, video card, and Power supply. shutdown ? Y--> one of the connected is the culprit (try another PS first)
if No shutdown, add devices 1 by one till the bad one is found
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ThomasBallardITCommented:
Probably overheating check your cpu and you might want to add thermal paste to it.
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ThomasBallardITCommented:
Also check your fans to see if they are filled dust.  Most likely overheating from what you say is happening.
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drmarstonCommented:
Based on your brief description, sounds like 1 of 3 things:
1) MBR corrupted
2) Windows itself is corrupted (could be drivers, but hard to diagnose when system won't boot).
3) Hardware failure

I would start with UltimateBootCD 4 Win ( http://www.nu2.nu/pebuilder/ ) [Every Admins best friend!] to see if the disk is readable and to run other hardware tests (RAM / MoBo)


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http:// thevpn.guruCommented:
It could be a RAM problem try to remove the RAM and switch it's slot if you have any empty slots
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cctfstrategyAuthor Commented:
Update:
I have cleaned as much of the dust out as possible. All fans are running. I was even able to get to BIOS menu for a moment and noticed no temp alert before the system shut down again. I will try the Ultimateboot and see if that gets me anywhere!
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