Hi, I own a Lenovo Z560 for almost a year, I've been using it with dual-boot (Win7 + Ubuntu) for at least 6 months. About 2 weeks ago, the computer started making beep sounds(1 short beep) whenever I press a button on the OS selection screen. Now, I can't boot at all; the computer just goes to a silent state after the Lenovo Screen, I only get a black screen a little dash on the left top corner. Beeping sound is still there. I can still access BIOS options, tried setting the default. I tried booting from a CD, isn't working. Please help me.