I have the same problem with my NV53: one day out of the blue, after pressing the start button, nothing shows up on screen, no BIOS boot, no beep, fan runs for a few seconds, short CD drive noise, power light on. Touch function keys light up when touched ("P", backup, sound up/down), CD caddy opens when switch is pressed. It did restart once after the first malfunction, but nothing after that. I did install a Bluetooth USB dongle a few days before problem occurred, but laptop was working for a few days after the BT install though, before it stopped working. HD is working OK when USB connected to another PC. Tried the power down solution (remove battery, etc..), removed CMOS battery, re-installed CPU. I even changed the power button assembly because I initially thought that it was the problem, or a wake/sleep issue. Anyway, nothing worked. Looks like the motherboard is dead because rarely CPU fail (as per what I can gather from the web).