Screen wont come back on after hibrinating, computer is on and still on line but the monitor doesnt wake back up about half the time

Try plugging in another working screen with a new cable, and if it didn't work then it might be your Graphic card (built in) (and does your screen work only when u turn on your computer for 5 sec or all the time its black screen?)

most likely capacitor problem as these caps only have a 25000-40000 hour life span. when you do replaace the monitor , turn it off when not at the computer. even though it goes into sleep mode there is still a current running through the unit cuz if you move the mouse or hit button on keyboard display wakes up. I know this because I have done boad level repair on panels

I would just replace it, the cost to troubleshoot and repair will be more than new.

screen back light on the other side is busted which need replacement.

dont know how old monitor is but it may be time for an upgrade OR the pc/laptop/desktop? may need some setting changes for your wake time, sleep time, intervals, etc.? Sometimes if laptop,, you have to tap the power button to wake up after extended sleep times.

go 2 control panel and select power management and configre ur monitor time when it go to sleep mode. thanks

try to positioning well the video card inside the cpu,it will help you a lot,

it does not sound like it is a computer problem, but a monitor problem. you need a new monitor because last i checked, those monitors either cannot be repaired or the cost exceeds that of a new monitor. sorry.

This could be a problem related to Vista hibernate file. Please verify the steps here
and let me know if that solved your problem:

This could also resolve problem with a tower: http://annoyances-resolved.blogspot.com/2009/08/laptop-wont-resume-from-sleep.html

Hit the keyboard keys. It is better to just turn sleep and hibernate off and just use a screen saver or tun it off.