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Computer Screen "flashing"
About every four seconds, my computer screen "flashes". The green button light that says that the screen is on will disapear those every four seconds, as if I pressed the Power button (on/off) twice (as if to turn it on once, and then turn it off about a second later) those ever four seconds. I also can't turn the screen off manually (by pressing the button) unless I shut down the computer. I don't know what it is, or what to do. Help?
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Maybe give some free advice about: Computers?
Tighten all your connections. You may have a loose monitor cord. Most monitors power on automatically when the computer does, receiving a signal from the computer, so a loose cord can make it "think" that the computer's power is cycling on and off.
If that doesn't help, try opening the case and re-seating your video card. This will only work if you have a separate video card; if it's integrated into the motherboard, don't mess with it.
Failing all that, you might try testing the computer with a different monitor. If that works, then your monitor is bad and will need to be replaced. If you observe the same problem, then your video card or motherboard is bad. At that point, you'll probably need to take it into a shop for repair.
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