This HP Compaq Laptop was not turning on at all. There were no lights, sound or display. The client told us that it had stopped working suddenly and was not turning on since then. We diagnosed it and found out that the motherboard was faulty. Sourcing the motherboard for a laptop can sometimes be difficult but this particular HP Compaq Presario GQ-60 was a very common model and we easily managed to get the motherboard from a local supplier. We used his existing processor, RAM and other accessories and replaced the motherboard only. It was a success and the laptop came back to its former condition.