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It may be that you have not got the updated driver for it. if you on dells support website you can find drivers for your dell.
heres a link to dell site you should try trackpaddriverurl
click the download button and install the driver, or you can perform a windows update that should find the right drivers.
i dont think dell offers windows 7 drivers for your machine but the vista ones should work fine. but if not go to synaptics website here and scroll down for the newest drivers for the trackpad (youd want the xp/vist/windows 7 32bit)
Just boot from XP CD - pressing F12 should give you the option in Bios, allowing you to boot from CD when all is completed. Some PCs still need sata/scsi drivers loaded by pressing F6 in the install. If all fails read original manual that came with Dell 6400. If lost you should be able to download from dell support, using express service tag.
This happened to me using a Dell Inspiron laptop. The wireless switch was disabled and the answer was supposed to use both the blue Fn and regular F2 function key to enable wireless connection. I tried Fn and F2 together and it did not work. I tried just F2 alone and it worked.
1. Reseat the battery. 2. Remove All External Components 3. Check the battery connectors on the battery and the system. Examine the connector on the battery and the system. Make sure that there is no physical damage and that it is clear of debris. 4. Remove All External Components 5. Try a known-good battery in the system, if available.
If you did a clean install of Windows XP Vista has nothing to do with this problem.
I infrequently have problems with Dell drivers not working but when I do its because I've installed the wrong ones. I have gone down the wrong troubleshooting path several times because the driver said it installed correctly.....
I noticed that when you go to the Inspiron 6400/E1505 download page (http://support.dell.com/support/downloads/index.aspx?) you have the choice of selecting drivers from lots of OS versions including both 32 or 64 bit versions of XP. I would verify that you have the write driver versions and try again.
Another alternative is using the drivers and tools CD that typically comes with a Dell. You can run that and it should have XP drivers. If you don't have the disk you can also try getting the network card running, connect to the Dell site and running their driver ID wizard to ID the drivers you need.
Let us know if you have any other questions and please don?t forget to rate this post.