I have received an I Mac to fix from local computer shop. I have no experience with these, but have fixed hundreds of monitors. The I Mac will power up for a few seconds then shut down. If I remove the Hout, then the computer will power up. I can not find any shorted parts, bad caps, etc. Has anyone had any experience with these? Is there a common failure with these? Thank you to everyone for your previous help and if you have anything on this one. Wally Heise South Isle Repair Help make your TechAssist online repair tips database better! Submit your fixes here: http://www.circuitwork.com/techassist/tip/#tips To unsubscribe write to: techassist-request@xxxxxxxxxxxxx with unsubscribe in the subject line.