|POST error codes 161 & 163 indicate a dead CMOS (backup) battery. You'll need to replace the backup battery with a fresh one. |
IBM part numbers and replacement instructions can be found in the Hardware Maintenance Manual located here:
Select User Guides & Manuals.
On the next page specify your system type.
Select User's Guides and Manuals again.
Select Hardware Maintenance Manual.
Sorry for the detailed instructions, but when I drilled down to the manual the URL was so long/complex, it didn't work when I pasted it here.