On my ASUS K8V-MX motherboard, I have recently been finding every time I completely cut the power to my PC I had to reset all the bios settings. Decided the battery was run down, so replaced it, but upon test the battery (4 years old or so), tested fine. Since then I have again cut power twice, once to upgrade memory and once to try to solve a printer-not-printing problem by resetting the parallel port type. Every time, I still have to reset the bios, even with the new battery - why? Now another odd thing developed since the last refresh of the bios, and/or installation of a new USB printer, my optical mouse now stays on even when the PC is switched off but still connected to the mains (the mouse is asleep, the LED goes dim, but not off). Since new, I took a careful note of the bios settings, I doubt if anything is set differently now to what it should be, and this is merely giving me the twitches (a dim, eerie light at night from the mouse that is). Anyone have any ideas? Is the motherboard failing slowly?