Hi im new this site iv got a proble i have a dell desktop 4 years old it wont start up it loads to the windows xp screen then stops then shuts down.I tried in safe mode and does the same thing.it never makes it to the icons.i took out one of the extra hard drives and one of the dvd burners to see if it would start but it wontit just wont boot up does anyone know what could be causing this could it be the power supply all the fans work im stumped thanks dutrem