I have a Sony Vaio SVT14115CXS, running Windows 8. The computer was working fine up til yesterday. I did a normal shut down. This morning when I tried to start it up, it gave me a blank white screen. I tried Assist, Web and Sony buttons, nothing work. can not go to BIOS. no logo. I tried the difference methods suggested on youtube. I took out the RAM, put in another computer, it read. I took out the hard drive, it read as an external. what else can I do? any suggestion?