Karl Townsend wrote:

i had a CMOS checksum error on my CNC mill. So, I installed a new
motherboard battery. Now the CPU fan just comes on and it makes no
attempt to boot. Is the computer DOA? I checked connections and
wiggled stuff.


Remove the new battery & short out the socket for a few seconds, then
reinstall the battery. You may have some corrupt data in the CMOS
scratchpad RAM.