My laptop is just about 2 years old. I've just replaced the screen and the battery and now something else is wrong with it. The power jack had come undone before, and I had it resoldered and it worked for a little while, but now when Iplug my charger in, the power light and the battery light start to flash on and off but it stops when i unplug the charger. If the laptop is off, I plug my charger in and it says its charging but after about 5 seconds the blue power light and the orange battery light start to flash and it doesnt charge. Whats can i do to fix this once and for all?