and then it appeared that it logged on successfully. However, it produced no mining results. I hit the M option and then tried both auto and all options and both times No Device Found. I'd like it to use my old video card. What am I doing wrong? Any help would be much appreciated. Thank you!
3.3.0 turns off the GPU by default.
Edit:- turns off the GPU by default if asic is found.
Try your line:-./bfgminer -o http://pool.50btc.com:8332 -u (my email address) -p (my 50btc password) -S all
Take a look at the "read me" notes.
If your card is an older Nvidia then you will struggle.
is 50btc a getwork pool? 8332 is a getwork port. If it is stratum pool try 3333 instead.