crwdns2934241:0crwdne2934241:0 Dan

crwdns2934249:0crwdne2934249:0:

It appears the newer iMac's are more sensitive to power surges. Which likely killed your power supply and has damaged your logic board.

Did you check the onboard diagnostic LED's to see what they tell you before you replaced the power supply?

[image|1393039]

I would have started there, tell us what they show you now.

crwdns2915684:0crwdne2915684:0:

open