Last night I did the apples software update and the upgraded os x 10.6.8 was available so I let it rip. Well it bricked my iMac. This morning I re- installed from my original snow leopard disk and restored the system with out issue. So I did the apple on line install again and bricked it up again. I am now just restoring from my June 22nd time machine back up and will not be up grading until apple fixes this issue and releases some patches or something. So just be careful and have your start up disk handy.