HELP!! lawnmower in my machine

[h_slaughter]

OK; I'm a musician. I am VERY new to the whole home recording thing and I don't know crap about computers. I have a Compaq Presario (about 4 years old). I bought Cakewalk Music Creator Pro thinking I can start doing some recording at home. I installed it and I can import my MIDI stuff. But how do I record the rest of it?? I'm running my guitar and mics through a 100W PA/mixer that I use for live shows. I have a line-out going from the PA to the line-in jack in the back of the computer. But everytime I arm a track to record, all i get is a very loud growl that sounds like a lawnmower.

NOTHING I have tried can get rid of this noise. I've exhausted the help menu, installed all new drivers. Then I even completely unplugged from the computer and armed the track and got the same thing. Do I need to buy a better mixer or do I have to get all up in the technical stuff and change setting or install new cards or something?

PLEASE HELP!!!!!

 

[junplugged]

Your line out from the PA mixer might not match impedence w/ the line in on the sound card. See how that line out sounds when you hook it up to something else that accepts a line in. Are you using the tape-outs from the mixer? They should be ok. Also, try something else that has a decent line out like a cd player or something and see if your line in on the pc card is ok.