Can a Olevia 232 t 12 be used as computer monitor

https://www.manualslib.com/manual/114000/Olevia-Lt32hvm-Series.html?page=2#manual Here is the manual for your monitor. All the available connections ate in it.

Try unplugging and replugging after waiting.

you will have to use a VCR, DVD player that has a built in tuner, or an HD converter box. The HD converter box will have an antenna connection for the outside antenna. But will also have RCA outputs to connect your TV to the converter

You don't need any drivers for this. The Olevia TV has a native resolution of 1280x768 i think for displaying signal from cable. That is enough for a tv, it's not made to be a computer monitor. You will have to deal with it or buy a Computer monitor that can be used as a TV.

I don't think so! Some LCD panels have this option, but not Olevia. Unless you may raid thru the menu and find power save option: no signal shut down. I use to own One of the first "Olevias", but can't recall this option. But, newer "Olevias"are based on different platform, not those on "Wesitnghouse". Olevia use to be from Europe, now it's all China. I know, Audiovox has this feature.
Good luck,
anyway.

You have to go to graphic software on computer and manually select extended Monitor

You do not adjust the resolution at the TV set, the TV will display the resolution you are feeding it, just like computer monitor.

VGA cables are very common. You can get them at most stores that sell computer equipment

Restart your computer and tap the F8 key until you get the Windows Advanced Options Screen. Use the arrow keys on your keyboard highlight Enable VGA Mode (Low Resolution Mode for Vista). Press Enter. Then Enter again.
Windows will boot up in a low resolution which will make things look large. Raise your resolution to a normal level in Windows' Display Properties (in the Control Panel)
The next time you restart the computer, it will boot normally.

Plugging in the USB worked for me too!