Xp Hangs On Welcome Screen Will Work In Safe Mode in User to User Help Posted September 11, 2010 dell notebooks have a built-in hardware diagnostics. make sure your computer is off. if it is in a docking station or port replicator, remove it and plug the power supply into the wall. turn computer on. when you see the dell logo, tap the f12 key until you get a menu. choose diagnostics, press enter. let that run and see if it comes back with any errors.