I thought my iMac died this morning since it looked like this: But, i was able to shut it down by pressing the power button and restart it. thankfully, the screen fixed itself and the computer went back to normal. earlier in the day, my screen got garbled after i accidentally switch resolutions of the monitor but fixed itself without restarting. i don't know what is wrong with it. is my imac dying? is this a software issue or a hardware one? this is the first time i have encountered this "pixel garbage" as i've read it on the internet. my imac is a late 2007 model by the way with the ati 2600 hd pro card running leopard 10.5.6 and has the latest updates and whatnot.