Turn on the computer to enter the desktop with the sound of music, you listen to whether or not, there is a word that the system starts up normally, then it is the computer's internal display screen wires fell off, or the driver board burned, the need to repair or replace the display screen
If you wait for a long time or do not go in to the desktop of the sound of music. Then the problem is not good to get
ps. need step by step investigation, such as memory, but normal fan normal operation indicates that the memory is normal,
There is also the graphics card, you can try to unplug the external graphics card, the use of the motherboard integrated try
If a step-by-step investigation down to think is the cpu or the south bridge is bad, go to the repair store to repair the
Hope to help! I hope this helps.