I am trying to get a Dell monitor to work with an older power Mac. It has previously worked with the Mac. It sat idle for approx. 2 wks, now the monitor comes up until the final desktop is coming up and then goes black. The Dell D828L works with my IBM pc just fine. When I put my IBM monitor on the Mac it works fine too. Just can’t figure out what I need to do to the Dell monitor to get it to work with the mac again. Your help would be greatly appreciated.