I've never seen a message like that, but I can only think that it is the CMOS battery that is referenced. Most CMOS batteries are easily replaceable on the motherboard. They are normally small circular flat batteries. Note the + and - orientation when you remove it. You will probably be able to replace it at any store that has a reasonable selection of batteries. If not, you will need to try a computer parts store. There are computer battery on-line stores if needed. A relatively few motherboards have the battery connected to the motherboard and are not replaceable without the requisite technical skills and tools. As to changing the CMOS back (I would start with "default" settings), just go into the CMOS as the computer initially powers up and make the change. If you can not get into the CMOS, a lot of motherboards have a jumper setting to clear the CMOS and restore the "default" settings. You will need to research your motherboard. I've noticed lately that the terms "BIOS" and "CMOS" are routinely being used interchangeably. To me, the BIOS is the machine's settings that are on a chip and are not changeable without replacing or "flashing" the BIOS whereas the CMOS contains additional machine directions that are changeable by the user. The CMOS requires a small trickle of energy from an onboard battery to retain its settings. I hope this helps. Tom Mayer Darcy Lidge wrote: > I was using a refurbished Pentium III Desktop (no name). During the boot process, I kept getting a message "Warning: Battery low. 2.26V or V 2.26". I went into the BIOS setup and changed the CPU speed to manual. Now the computer will not boot. What happened? Could this be related to the CMOS chip and if not, what battery is the system referring to? > > > > Do you want to signoff PCBUILD or just change to Digest mode - visit our web site: http://freepctech.com/pcbuild.shtml