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If you're getting just a flashing cursor on a black screen it's probably a motherboard/video card/hard disk problem (probably motherboard).
If there's not even a flashing cursor - just a black screen - you can add a failed power unit to your list of problems.
The easiest way to check is to borrow a power unit and video card from a friend's computer. There's no need to remove your existing power unit. Simply disconnect the power cables from the motherboard and connect the spare power unit in its place.
If your computer powers up it is obviously a faulty power unit to blame. IIf there's still nothing on the screen, power down the computer and replace the video card with the spare one. If there's still nothing on the screen when you power it up then in all probability your motherboard is history
Hmm? Everything except replacing the motherboard, sometimes it does not get any better, but...go into your BIOS and turn off the Gateway splash screen. It will be an option in maybe the first or second menu choice. Make sure your on board video device is disabled and save your options when exiting. Good luck and let me know how it turns out.
it seems to be an issue with the power supply as you already tried replacing the motherboard
power supply will be less expensive do try to get it replaced first
do check that monitor iss fine
unplug the blue VGA cable which connects your monitor to the tower
if a 4 colored box moves all over the screen the monitor is fine
and if it doesn't
get the monitor either repaired or get it replaced.