|Sorry about the charging/changing thing. |
You didn't answer if you had the computer unplugged when changing the battery.
The computer will run without a CMOS battery.
Sounds like your drives are now configured differently than before, or the cables were disturbed. You said you wrote down the values so I would first check all the connections by re-seating them.
If you were confident that you restored the values as before then why try using different settings?
If checking the cables didn't help then I suggest you set the values for each page to the defaults and try that.
The Dell specs for your computer indicate you have an IDE CD drive and a Serial ATA 150 Hard drive (SATA). See if there is a setting to run in an IDE mode.