I bought a laptop on Gumtree for very cheap. HP Pavillon DV7-3190ei. After a day i switched it on and the screen didn't come on. Gave it to a technician and he said the motherboard is dead. Realized he didn't even try to see if the screen is the problem, he just unscrewed. He should have connected the laptop to an external screen to see if it switches on. Anyways i have the laptop back but its no longer beeping when i power it on. I need a technician ASAP. Thanks !