Tonight I went to power on my iMac G5 and it did not respond. It was dead. I smelled burning electronics but it was not very strong. I was a little hot at the back left of screen. I unplugged it and let it sit for 10 min. I thought Oh great my iMac is dead! Then I went to try it one more time just in case and it powered up fine! Typing on it now. Should I be concerned? 
