I am installing windows XP on a Dell 745 - when it reboots to continue with the setup- it just hangs on the Windows XP splash screen..... The light does not blink/power light is on/ i waited all night- went home and came back and it was still on the splash screen- I switched cd drive, same. I switched memory, same. I switched cables for the cd and the HD same...... I changed the sata port on the board, started it, hd light came on for a few seconds at first and then went off- the network link light is on- and the keyboard num lock light will not come on- if pressed..... its frozen- splash screen on bar moving across..... what could be doing this?