Basically my computer has broken for no reason It just wont boot up. When I tern it on the light on the PC and the fan will tern on but nothing happens, the fan starts but it sounds all groggy and shit. usually when i tern it on it sort of goes errr URRRRRR but now its just going errrerrrrerrrrrerererrrrr and it sounds very ill If you get me? All it says is "no signal" on the screen, then the screen terns off. Has anyone got any idea what is wrong with it so the PC shop dont make me fork out £300 again Cheers