I'm going to assume my processor went out on me here, or motherboard. I usually leave my computer on overnight and woke up to find it off the other morning. I turned it on, fans ran, power light and HD light was on but my screen was blank and in screensaver mode. I shut down and tried again a couple times and after the second or third time I had no power at all. Thinking my PS was bad I replaced that but had the same outcome as above. I then tried a new video card and had the same outcome again. Gigabyte 945P-S3 MB Processor, can't find the paperwork but it is a core 2 duo processor, possibly 2.93GHz but it's 3 years old so maybe slower. My processor heat sink was pretty loaded with dust so assume I burned it out. I seem to be pretty limited on inexpensive replacements but may try a Pentium Dual Core E6500, not too expensive but I'd hate to be limited in MB's if that is gone. I put in a cheap 400w power supply to check that, then a Gigabyte HD 6450 video card. I did pull the processor, all ram, reset everything but also took out the MB to look it over, no signs of burning. I did try booting up without the floppy and CD drive, same result, as well as swapping ram to different locations, no change. What should I look at next?