Hello, after being turned on for about 20-30 minutes the corners on the screen gets darker and darker. The computer has not been turned on for atleast a year but seems otherwise to work ok. What causes this problem ? At startup all is ok = screen is normal. Thanks for any tip I can get / Hans
iMacIntel + iMacG3/600 MHz, Mac OS X (10.5.7), SE/30, PB 540, LC III and Quarda 700
