So I got a A855 on Saturday (from Ebay) and for awhile it worked great. Then the screen wouldn't come up unless I slid the screen up and down a few times. Now today, the screen won't light up at all (it's just black) but everything else works. I can still do touch screen, and I'm now getting a constant red notification flashing on the upper right portion of the phone. It usually flash green whenever I have a new text or e-mail. Can anyone help me in fixing this, please?