I've got a self assemble PC,its very new and hardly been used because I can't connect it to internet. After I have move it to another house, and I can no longer boot it. This is what happened every time I press the power button, the PC would be running( judging from the sound) for about 4 seconds, but before anything appears on the screen, the computer has already shut down itself( complete silience ).

I would gladly apppreciate if anyone could help me out, thank you very much.

If you're moved it from one place to another, chances are something has become loose. Open up the case again and ensure everything is seated properly.

I tend to find that if a PC is shutting itself down, then it's some kind of protection. For example, there may be a shirt circuit somewhere and the power supply is turning itself off to stop it from doing any damage.

Have you had much experience of putting cases together? If it never worked properly in the first place then it sounds like something is missing/in the wrong place.

Thanks!I'll check it out.