How do you set up a wifi connection on a dell c600/c500

Check the Dell website or perform an Internet search using Google or Yahoo. No manuals here.

Here you go!
http://support.dell.com/support/downloads/driverslist.aspx?c=us&l=en&s=gen&os=WW1&osl=en&catid=&impid=&SystemID=LAT_PNT_CEL_C500

Change the BIOS battery

The keyboard fix is easy, replace the keyboard, same for the battery.
Manual is here
http://support.dell.com/support/edocs/systems/latc610/sm_en/index.htm
you can buy a keyboard here
http://cgi.ebay.com/New-Keyboard-Dell-Latitude-C510-C540-C600-C610-C640-/170342472542?cmd=ViewItem&pt=PCA_Mice_Trackballs&hash=item27a933db5e#ht_2468wt_1202
battery here
http://cgi.ebay.com/66WHR-Battery-Dell-Latitude-C500-510-C540-C600-C610-/280475115213?cmd=ViewItem&pt=Laptop_Batteries&hash=item414d9e9ecd#ht_2340wt_1734
S-Video on that model pretty much requires a direct S-Video to TV connection, then enable the TV in the Display properties. If you are trying to use an adapter, it will not work

All drivers for XP in the C600/C500 should be native to Windows XP Dell never shipped XP on that model so they never had any drivers for XP.
If you have issue with USB devices on that model, try booting to the safe mode, remove the USB devices in Device Manager, then reboot in normal mode and let them re-detect.

try connecting a seperate screen - if it works then you back-light mught need replacing. if you see nothing still then you might want to take the laptop back to where you had it fixed

Battery is bad...you need to get a new one

Check the settings in the bios to enable the track ball. Most of the time that is where it is enabled or disabled. You can also check Dell's support website for additional software that may allow you to configure additional settings (similar to IBM/Lenovo Thinkpads).

I don't recall the specific key to press to get into the bios, its either F1, F2, F10. You need to do this from a cold start when the laptop is off. Press the power button and when you see the Dell logo, look for the bios settings key to press or press one of them that I suggested. Sometimes this may go by quick so you need to be quick about it as well.

Hope this helps!

Try this link....please note its a multipart file

http://www.eserviceinfo.com/downloadsm/20308/

you should be able to go to www.support.dell.com