i think its battery related. i just learned something.

when i reboot the system on a/c power i get no error watsoever.

only on battery power do i get the message so i assume once again its cmos not the actual battery.

the actual battery charges as normal when plugged into a/c power.

i did. and i can boot into windows. but when the laptop is shutdown and i boot up again the same error message comes up. as if i didnt change the cmos at all and i did.

hello, my aunt asked me to have a look at her ibm t23 she has had for years. she does windows updates regular and the system has never given her an issue until this week i get the following errors: 0271 error: check date and time settings. 0251 error: System CMOS checksum bad. Default configuration ...