I have a windows based system that recently shows black screen at the time of rebooting process. It also display error message "CMOS checksum error - Defaults Loaded". Because of this error message, i can't able to shut down my system by long pressing power button of CPU. My friend suggest me for do some changes on the BIOS, but keyboard not help to make such changes in BIOS. So, now i am expecting that some expert give me valuable technical solutions. Thankful for any such.