Dell 9200, windows XP operating system normal updates, on start up normal screen comes up, then Dell XP 061, BIOS 2.5.3 with loading bar gets to end of bar then returns to start up screen. keeps repeating cycle. no beeps at all. cant check light codes at moment as running diagnostics... "express diagnostic test" ok, "cannot boot OS diagnostic test" running now and so far ok..... complete noobie, any suggestions. only thing on computer of concern is family photos, if nothing else would like to be able to get them.