When I turn on the computer I have: CMOS Checksum Bad Press F2 to Run SETUP Press F1 to load default values and continue So when i chose: F2 there is a black screen: "Wait..." so i'm wating...(2 Hours) But nothing happens. I took out the battery for the BIOS and after 1 hour i put it back. This action did not change anything. when im pressing "del" nothing happens. Each option gets stuck i just connected my wacom bamboo pen to the computer, and after the restart my computer offers options. i can do something to fix it?