I have a Samsung Syncmaster 193V Magic Tune flat monitor and after it has been on for about an hour big flashing, vertical, bold coloured lines appear across the whole screen. It looks like a giant coloured barcode. The flashing stops after a couple of minutes, the screen freezes, and the vertical lines disappear leaving black and white horizontal lines. I have factory restored the computer, and I have had the monitor replaced by Samsung. If I switch the monitor off for a few minutes and back on again it is fine for about 20 minutes and then it starts again. The computer is fine otherwise, everything working. I connect an old monitor and everything is fine, leave all programmes running and swop back to new monitor, within the hour its performing again. I have replaced monitor cable, and have wiggled everything possible, I have checked all my drivers and ATI Radeon 9550 graphics and they all say this device is working properly. In the menu on the monitor, it says the monitor is ok.
The inside of my computer is clear of dust and the fans work ok.
I have been to loads of help forums etc and have got nowhere at all with this problem so I would really appreciate any help at all.
Many thanks, Eric
