iMac NOT turning on after Yosemite install and SMC reset

So, here's the scenario....

I resisted upgrading to Yosemite, and in a weak moment, decided to upgrade my iMac and MBP. Both computers seemed to run much more slowly, despite being relatively new (the iMac is just 3 years old and now out of Apple Care and the MBP is just under 2 years). Anyway, I decided to run some Utilities....permissions repair, verifying disk, reset PRAM, and reset SMC. The MBP seemed better, but the iMac still lagged some, so I decided to run the Utilities once again.

After resetting the SMC, I cannot turn the iMac on. Totally DEAD. Pressing the power button does nothing.....

Please help!!!!! Thanks.