Cannot restart my computer

[Yarie]

Yesterday, while typing on my machine it began responding very slowly
- occasionally I had to wait 30 seconds since I typed letter to see
them on the screen.
I rebooted my machine, and since then I cannot restart it.

When I restart my Windows XP PC, I see the welcome screen with the
usual WinXP logo.
Then when the desktop should appear, I am seeing a black screen with a
mouse cursor on it.

I tried replacing the power supply, replacing the hard drive and
reinstalling WInXp (on a formatted drive) but nothing worked. In fact,
during the WinXp installation process, when they reboot the machine I
got the same problem.

Does anyone has an idea how can I solve this problem?

 

[Rock]

Yesterday, while typing on my machine it began responding very slowly
- occasionally I had to wait 30 seconds since I typed letter to see
them on the screen.
I rebooted my machine, and since then I cannot restart it.

When I restart my Windows XP PC, I see the welcome screen with the
usual WinXP logo.
Then when the desktop should appear, I am seeing a black screen with a
mouse cursor on it.

I tried replacing the power supply, replacing the hard drive and
reinstalling WInXp (on a formatted drive) but nothing worked. In fact,
during the WinXp installation process, when they reboot the machine I
got the same problem.

Does anyone has an idea how can I solve this problem?

Check the memory. Run these diagnostics. Let them run for some time,
not just a single pass. Download them an create the bootable CDs. Run
the diagnostics from there.

Memtest86+
http://www.memtest.org/

Windows Memory Diagnostic
http://oca.microsoft.com/en/windiag.asp

 

[Jeff]

try starting your pc in safe mode (F8 as win starts to load).... your OS may
be overwhelmed with spywear or virus.