My mates having this problem: enjoy ur read
Turned computer off one night, woke up and turned it back on, only power flickered on for a second then all power went. took sides off, cleaned all dust, realised graphics card fan had melted off and wires were detached. put the power cable plug into another socket, and the computer turned on but didnt boot, no display on screen (obviously). then turned computer off and back on and again, power flickered on then off again. today i bought a new graphics card and put it into my system, and the same problem still faces me. the computer irregularly turns on but with no display, or wont turn on at all. how can i tell where the problem is and what can i do?