I recently formatted and reinstalled Windows to my computer, a Pentium 4 2.3ghz system. Before a reboot I installed Nvidia drivers and installed my HP printer. During the install of my printer it had a conflict with my external hard drive. I turned off the external hard drive and finished the install and went to reboot. Right before the reboot an error message with a red X symbol came up and counted down to 30 seconds to turn off. Once it turned off I went to reboot and it would not boot. I hear no POST beeps, the fans turn on and s forth but nothing happens. Nothing comes up on my monitor either. I have tried both my PCI video card (the aforementioned Nvidia card) and my Intel video card that is built in. I really need this computer to work for school and cannot afford costly repair bills currently. All help will be greatly appreciated!