My 4 year old Studio Slim 540 went to sleep yesterday and wouldn't wake up by moving mouse or typing on keyboard. So I power machine off. Now it will not complete POST. I get one long beep and then 3 short beeps. The F2 or F12 key is not responsive. I've removed and reseated all cards except video card and removed and reseated memory modules. Machine will not complete POST. Do I have a bad motherboard?
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