T400 screen blinks, goes black, then returns

Hi & hope someone can give some guidance.
I have a T400, Win7Pro 32bit that has been acting strange. It is a problem that I sent it back for right after I got it, but now am out of warranty.
While using it (not at start up, usually has been running for a while), the screen will flash, then go completely black for a moment, then return to its previous state. Last night it happened while I was on the webcam, and I never lost audio only video. The computer does not give any indication that it is going to sleep. The previous times it has happened (all in the last three months), I did not lose anything I was working on.
I know this is terrible, but I am not sure which display this is. It only says ThinkPad display 1440X900. Location is on ATI Mobility Radeon HD 3400 Series.
I've been searching, and seen something about a switchable graphics problem. Could this be it? How would I correct that? Or am I looking at a dying something?
Thanks for any help you can offer.
Sam

lead_org,
Thanks for the reply, but I am not sure what you mean. I have never changed the video card mode, if that's what you mean. I rt click on the battery icon, go to switchable graphics, and the flyout says I'm set for High Performance, which I assume means I am using the ATI card. My Power Manager is Power Source Optimized (rarely use the battery. It has been plugged in for all these events). If there is some other information I can give that would help, let me know what you need.

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I understand that you are having issues with your HP 2310m monitor going blank and/or flickering. I am providing you with some steps you can try below:
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Thank you for posting on the HP Forums. Have a great day!
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Also be sure to mark my post as “Accept as Solution" if you feel my post solved your issue, it will help others who face the same challenge find the same solution.
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T400 screen blinks, goes black, then returns

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