I have an Asus X550D laptop, had it about 16 months. A couple of months ago while using it i heard a loud pop after which the laptop switched to battery mode. I tried the power supply in another compatible laptop and it wouldnt work. I tried a compatible power supply in my laptop and it worked. I changed the fuse in the plug for my power supply plugged it into my laptop and it was fine for about a week befor it went pop again. I replaced the fuse, and as soon as i plugged it into the wall it blew again. I took a trip to maplin and bought a new power supply. A universal one with different power settings and changeable ends. This worked great about 6 weeks until this morning when streaming a film from the laptop to the tv , it went pop. The fuse had gone so i replaced it but as soon as i plugged it into the wall it went again, with a flash in the power supply. Any ideas what is wrong with the laptop that is damaging the power supplies? I can go buy another power supply but there isnt much point if my laptop is gonna keep destroying them.