problems exiting standby mode -- LCD screen will not turn on

I have a latitude x300 and about 50% of the time when I exit standby mode, my computer will obviously come back to life, but the LCD screen will not. It remains black, as if it is receiving no power. The only way to get the LCD screen back is to power cycle the computer. That works, but not very efficient... I have also tried fn F8 to try to force the LCD screen to come back on, but that doesn't work either. I recently reformated my hard drive, reinstalled the operating sytem, and updated all the drivers (yes, the BIOS is the latest as well), and none of this helped solve this problem. Have any of you seen this or do any of you have any possible solutions for me to try? Thanks for any advice that you can give.