When the computer is on its fine. The initial screen comes up with all our various names on. I go to move the mouse to click on my name and the screen goes black. If I turn off the screen again, it comes back on for a second or two until I move the mouse
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Sounds like your screen is being switched to "Power Save" mode due to inactivity. This should switch back when the mouse is moved. This can take several seconds on a laptop. You can remove this "Power Save" by right clicking anywhere on blank desktop, select "Properties", "Screen Saver" and "Power Settings" then select "Always On" for the monitor.
it sounds like your most likely having trouble with the hibernate feature try this
start>>control panel>>power options>> click on the hibernate tab un check enable hibernate mode
this should fix your issue
Did it work properly using a VGA (analog) cable? If so, check your DVI (digital) cable against the pictures at the bottom of http://www.datapro.net/techinfo/dvi_info.html. You probably have one of the two at the left. Each has a different bandwidth, translating to a maximum resolution. The native resolution for your monitor might be marginal if you have a single-link DVI-D cable. My 204B seems very picky about signal-level. It blinks when connected by DVI, even though it should be fine with a single-link cable, and complains about the settings even though the settings are optimal. Maybe yours is similar. I have ordered a dual-link cable and will try that myself.
this can be caused by many reasons, here are some that comes to my mind:
1. bad connection between computer and screen, usually an easy one, but since its a laptop, you cannot change cable, so you will have to take it to the lab. anyway, if it is the problem, fixing it should be cheap.
2. in order to make sure it is "only" a faulty monitor, connect the laptop with another monitor, I dont know the exact function in this specific model, but as long as it has an video output, it can be done.
3. it is posible that backlight invertor has short circuit and should be replaced. this one can cost up to several hundred dollars, so be prepered.
hope this helps.