Windows 10: Monitor turns off when computer turns on and will only reconnect once replugged in

When I turn the computer on, the monitor will initially turn on but then quickly turn off once it connects to the computer. It will only come back on if I take the wire out and plug it back in to the monitor. It won't even turn back on if I switch it off and on at the socket. Once the monitor is back on, it is completely fine with no problems after that. This has been happening for a few days.

:)

 

Monitor randomly turns off without reconnecting to computer

While browsing the internet on my computer, after about 2 minutes, my monitor will turn off. I can turn it back on, but when I do, it cannot reconnect the display to my computer. The computer remains on, and so does the monitor. The only way to fix this
that I could find is to force restart the computer with the power button. When I turn it back on, the display works fine until this problem happens again. Recently, I turned on hardware acceleration on google chrome and switched from a wireless to a wired
network connection. I tried updating my drivers.

 

Monitor turning offf

In windows 10 in the morning after monitor goes to sleep it will not turn on. Have to unplug monitor's electric and replug in for it to work. How can I correct this problem?

 

Computer Is Not Turning On

The seller had barely used it because he said he didn't have time to game. Besides, wouldn't a computer still be able to turn on without a video card or integrated graphics card? (Although you would be extremely limited with its uses if you wanted to do anything at all.)

It's not just that video card, if you wanted to blame my video card, I suppose I should have also mentioned that after I tried to turn the computer on with the HD 5850 inside it didn't turn on and after I replaced it with the original temporary video card, and the computer still didn't turn on. Before all that happened, my computer was working fine. It may have had something to do with how I had to move and unplug/replug connectors, wires, and cables in my PC due to necessary adjustments to fit the video card into the case.