This morning when I was typing an email, the screen of my pc suddenly became black and the led of the screen indicated there was no signal. I pressed the power button, but nothing happened. I pressed the reboot button, and again, nothing happened. I could only shut down by disconnecting the power cable, and after that I was able to start the pc, but after 2 minutes the same thing happened. Now it only shows the POST or doesn't boot at all, and I cannot enter windows anymore. I opened the computer to check if all the cables were well connected, but they were. Does anyone have a clue what component might be faulty or what else could be wrong? Thanks in advance