My computer shows ethernet controller with a question mark how to fix it if cant

lesantiago2

Distinguished
Jan 5, 2012
5
0
18,510
I recently pu a new hard drive on my Dell Dimension C521 (runs on windows xp) and had to reboot the whole system.after installing all the CD the computer came with it still will not pick up ethernet controller. the ethernet controller shows up with a question mark..... but how to fix it if that computer will not pick up my internet. How can I fix this ? :(