We had a bad storm come through with lightening and booming thunder. After that my Imac OS X Snow Leapord will not start. It was on a surge protector power strip. Nothing happens-no sounds, lights, etc. -tried all the recommended solutions online but nothing works. If i hold power button for about 20 seconds, a fan will will blow and will only stop when i pull the power cord. I have not put in the install DVD because i fear if i get it in, i would have no way to get it out. Have had the computer for about 15 months. I hate to lose another $50 (along with all my documents, pics, etc) just to hear that there is nothing to be done to help.On all the posts, I have not found one that says the fan will eventually blow out the the top which lets me know it is getting power. Please help. Thanks