Great board you have here. I could use a little advice and will try to describe my issue clearly. I have a PC about three years old or so with K7S5A mobo(not sure on rev number) with AMD 1900+ processor and a gig of ddr ram. Yesterday out of nowhere when I turned on the system it started powering up (i.e. you could see led lights on hd, cd and cdrw as well as hear fans) the nothing. It did not make it to the first "beep" and monitor went into powersaving mode. I threw in a music cd several times after this to see if it was just monitor or vid card but no music. Since it didnt make it to first beep I am thinking it didnt boot up and is beyond a video issue. I took off the cover and blew out good with air etc....The pc booted up. Now the pc will run for hours at times or other time may not boot or may boot and then just quicly die to the aforementioned condition. I also ran the MS supplied memtest boot diagnostic which indicated no memory issues. The powersupply is only a month or so old and when this issue occurs there is actual power as again I see the led and can even open the cd. Last thing I can think of to mention is that for the life of the pc I have had an occasional checksum error during bootup that then requires me to go in an reset values in the bios ........has happened since I bought it and never been an issue beyond a pain in the ****. Any advice appreciated. I am guessing I must have either a cpu or mobo issue but I am far from a hardware expert.