1. DO THIS -> http://reviews.cnet.com/4520-11319_7-6240575-1.html
After the cleanup and after a power up, shutdown and if it still fails open it again and GENTLY push all cables and cards home.
2. Replace the hard drive and load the OS from the recovery media.
I have been having problems with my HP desktop with windows XP system
first started with cant find operating system. now comes up with blue screen says errors then says crash dump. Cant get it to work what can I do?