Ubuntu on a Vista Dell

[aaronbp0]

I bought a Dell Inspiron E1505 with Windows Vista about a year ago, and have upgraded to Ubuntu, but for some strange reason, I can't turn on wifi. Ubuntu says it's on, but the LED isn't lit, and even when I'm in range of my network, It says there are no networks available. Is there a way to fix this, or do I have to always use an ethernet connection?

Also, I installed Ubuntu on an exterior hard drive and need it plugged in to boot even Vista. If I try to boot without the exterior HD plugged in, it right after BIOS boots, it says "GRUB loading... Error 21" and I have to reboot with the HD plugged in. How can I fix this?
Thanks.

[linux_tech]

HOWTO for Dell E1505 Wireless
http://ubuntuforums.org/showthread.php?t=297092

These links explain how to fix Grub error 21:
http://ubuntuforums.org/showpost.php...82&postcount=2
http://ubuntuforums.org/showpost.php...42&postcount=6

[aaronbp0]

Thank you!

[aaronbp0]

I installed Ubuntu on an exterior hard drive and need it plugged in to boot even Vista. If I try to boot without the exterior HD plugged in, it right after BIOS boots, it says "GRUB loading... Error 21" and I have to reboot with the HD plugged in. How can I fix this?
Thanks.
Hmm the links you posted just took me to the main page for this issue... how do I solve it?