Hi last week my 550w psu blew up, i got a new artic 500w psu, yet it wouldnt fit in my case, so i now have bought a new collermaster case which is kind of a smaller midi tower for some reason....., anyways i switched everything over and im getting "No signal" have checked all wires the pc boots up yet i dont hear any beeping or anything..., the only thing i can think of is that either my mobo has gone or my gfx has gone due to the psu blowing?, anyone got any ideas i can check?

If your monitor is displaying "No Signal", then it is usually your graphics card. If your video card is integrated into the motherboard, then you'll have to replace the entire motherboard (unless there's a slot for a graphics card).