A customer said his computer would barely start windows, before a blue screen would flash-up briefly, and then the computer would restart again.

I suspect either a faulty power supply, or a bad windows driver.

The start screen shows 2 windows “boot” installation. The customer says he tried to reinstall windows a few months prior, but with no success.

The blue screen is the typical XP BSOD, but there is no time to read anything before the PC restarts.

I try safe mode, last known good configuration, but no luck.

I try the second XP installation. It takes about 10 minutes to do a file system check on NTFS, and then complains about no XP media in the CD drive.

At this point, I restart, and now the system starts normally. Great!

A quick RAM check (no problems), and my work is done!