E75 screen gone goes blank?

Question

Hello,
I have a nokia e75, when I first got the phone I had trouble with it because it kept saying sim card recognition. This stopped when I got new sim card. Recently I looked at my screen and the screen saver looked pixelated, a couple of days later my screen went blank, I could make and receive calls and hear the phone working but couldn't see anything on the screen. I removed my memory card and sim card and tried the hard start, press and hold * and 3 and the call button. It came back to life and worked fine for a day and then the same thing. Has anyone else experienced this or know how to fix it? I don't think there is a problem with the screen itself because it worked again, and after i done the hard reset I updated the software aswell, so I really don't know what it could be. Any help would really be good.
I just turned my phone on again and it worked fine in offline mode, knocked it off and put my sim card and memory card back in and its fine again. Can't work this out ata all. I am sure it will go again tomorrow. Sim and memory cad work fine in my old phone so I dont think there is a problem with them either.
Please help. I am afraid to go to a nolkia centre as it is an intermittent problem and the screen could be fine when I get there.

Answer 1

The AHT doesn't test everything, but it does test a lot of things.
When you watch video online, that is considered a processor intensive activity, so the computer including the graphics chip will tend to run hotter. There have been some instances of people getting black screens on earlier models when doing graphics intensive things such as playing some games. So it may be that when your graphics chip gets to a certain temperature, it may shut off to avoid overheating, so you would get a black screen. However, I don't think that would be considered normal behavior. You should be able to watch video without your graphics chip shutting down.
One thing to look at--is your Mac on a hard surface so it can properly cool itself? It needs to be on a hard flat surface and the vents must not be blocked. Air must be able to flow freely around it. It can't be on a pillow or other soft surface. You may even want to try a chill mat.
Did you run the AHT when the computer was hot? It may be that whatever happens would only show up if the computer were hot.
Do you have the widget iStatPro? You can download it from the Apple site. It will allow you to monitor the temperatures and fan speeds among other things. It might be instructive to see what kind of temperatures you are encountering when the screen goes black.
Here is a link to an article on what to do if you have no video. It may be that one of the resets will fix your problem:
http://support.apple.com/kb/HT1573?viewlocale=en_US
If the problem persists, contact Apple. You are under warranty, and if there is a problem with your graphics chip, they will fix it for free under warranty. Be sure to do this before your warranty runs out, and consider 3 year Applecare if you don't already have it.
Good luck!