E228WFP display disappears

New monitor E228WFP bought February 10, 2009 (with Inspiron 530) and has been working like a charm until 2 days ago. The display suddenly went black but the green power LED stayed on. Shut off the LED, turned back on, monitor was fine but same thing happened perhaps 10 times during an hour or so. Updated driver, checked for viruses, etc. - all the usual troubleshooting - could find no problems. Noticed the monitor seemed hot at the top of the back.  Shut monitor off for a few minutes, re-set, and it was fine for 48 hours. Then this afternoon the same issue, and I immediately noticed the back (at top) seemed quite hot to the touch. Shut off monitor, and in a minute or so, when turned on, has been on with no problems since. Has gone into power saving mode when it is supposed to (orange LED) and also to sleep when put into that mode.

The display blacking out but the green LED light being on is not normal of course. It does not do the "auto-detect" thing either when it blacks out like this. I have it connected with the analog cable and checked all connections. Other than these few times, it works normally and is beautiful. Both times this has happened, it has been a bit "stuffy" in the area where the system is - in a dead corner of the room in a computer station - plenty of ventilation - but temps on the warm side (80 degrees or so?) Seems to be an issue only when the area seems a bit warm and muggy.  We do run a/c regularly if it gets really hot and/or humid, and will be logging any more instances, keeping track of temps.  Sorry for the long description but I could not find anything in a search that others have experienced this.....

Is this a problem based on heat/humidity?  I know computers are sensitive and I wondered if the display blacking out was a warning of some sort that the monitor was about to overheat and this was a protection device (shutting down).  Any thoughts would be greatly appreciated. I will report anything else which happens in the future, just so anyone else with this issue will be able to follow it. I find these forums most helpful and that is why I am submitting this.  I doubt the problem is a backlight issue since it comes right back on when re-set and when the temps are "normal" we have never noticed any problems.

Thank you for any comments.