when i try to boot my cpu it shows the "E" symbol with white lines through it and sometimes they are flashing. after about twice as long as it usually takes to get to the next screen, it gets there but there are green vertical rectangles that flash all over the screen. i have gotten my cpu to boot once perfectly and i ran an avg free virus scan and it found nothing. i also got into safe mode and i opened spybot search n destroy. as i opened it an error message popped up and said that the program has been changed since it was last used...and then the screen went blank and there the "e" symbol is with those lines through it again. at this point i just turned the cpu off. this is the second day this had been happening and i unplugged the cpu over night. its a desktop and the power went off about a week ago and there was a power surge right after that while i was away on vacation. i went away for 2 1/2 weeks and it was working perfectly before i left any ideas?