My friends' pc is stuck in the cycle of booting to the:
-run in safe mode
-run in safe mode with command prompt
-last know good configuration
-start normally
menu.
After choosing any option it restarts. the power unit was replaced recently, and it used to have 2 BIOS's but one died. Regularly the pc was crashing with the error of failed BIOS (or similar).
Windows xp (genuine) that was "built from different parts". (sorry can't be more detailed).
Any ideas?