My computer monitor takes at least 2 -3 hours time to get to its proper color. Within few seconds of switching on the computer, the screen turns into a glowing light and nothing can be seen on the screen. If I leave the computer at this stage for a minimum of 2 hours, it sometimes regains its actual color but sometimes stays the same. At times tapping on it works but sometimes just for few seconds only and it becomes white again. Do I need to replace the monitor or the problem can be fixed otherwise?