I have a Dell All in One PC since 3 years. I installed Windows 8 last year and it was all good till yesterday. Today, when I tried to switch it on, it just doesnt get switched on. I opened up the cabinet and blew air to clean up the dust , and then it started, but again switched off automatically after 2 minutes. After that, Im trying to click the start button, but just nothing happens. But the yellow light on the mother board keeps on glowing . What can it be ? How to debug ?