There could be several reasons, here are a few: The monitor is broken or faulty
The cord from the monitor to the tower is faulty, or not properly connected
The power cord for the monitor is faulty, or not properly plugged in
The device driver might not be functioning properly
If the videocard is new and an integrated one was previously used, the previous one must be disabled through device manager.
**You can use Safe Mode with the monitor to see if the second 2 are the issue
computer
you restart the computer then turn it on again
A computer can not turn off by itself. The monitor just turns blank it you leave it. To turn off the computer you have to prees the on button on your computer. If you press the botton on the monitor it is not turning the computer off... just the screen.
Check your cord from the computer and monitor. If that is ok check your video card.
Get new one.
A TV tuner card
notebook
The first thing I would try is to hold down the menu button for 15 seconds. This should work but if it doesn't then try this: * Turn the computer and monitor off * Disconnect all monitor cabling from the monitor (power, USB, VGA, DVI, etc.) * Press and hold in the monitor power button in for 5 seconds * Reconnect the monitor to the computer * Reconnect the monitor power cord to the monitor * Turn on the monitor, then the computer * Press the Menu button for 15 seconds to unlock the padlock feature
if you mean to connect it to a tv and your computer and tv has a monitor port you can use that
turn the computer monitor the sideways
the monitor will have a power button on it. Depending on the type, it may be in different locations, but it shouldn't be hard to find. Turn that on.
Your motherboard must support this function, check your bios settings and activate it