Quote Originally Posted by bin20 View Post
u mean the cmos battery ? i cleaned all the dust , and i still get that problem evry ather day . i mean , when i turn on in the morning i see the problem ,
Yes, the CMOS battery.

I installed the spare one last year just to be sure I had no issues, and beyond cleaning it's all I can think of for maintenance. If it doesn't help, it also shouldn't hurt...