Don't know if I've got this problem on my 40D, I haven't connected with USB for years! Have you tried the Canon EOS utility, this is at least made by Canon to connect their cameras to a pc. What OS are you using, try restarting your pc while the camera sits without batteries, try connecting then power on camera and power on then connect camera.
I have just looked and can't find it in the menu, but it's late here and I may have missed it, I've had problems on one of my cameras not connecting because of a menu setting of ptp or normal output, may have been 20D.
Not a problem until you want remote shooting over USB! Hope you get to he bottom of this.
Welcome to the forum Benny.
Hey All, new member
I've had my 40D for a while now and I've got a problem.
It's not been a problem and still isn't, but if I plug it in via USB to my PC or Tablet, all I get is Busy on the lcd, then nothing..
It won't connect to the PC as a mass storage device, It won't even connect using EOSInfo to check the Shutter Count..
I took it to my local specialist shop and same thin, I can't connect my 40D to a PC using USB.. I've tried FW 1.0.8 and 1.1.1.
Anyone else have this issue..?