Originally posted by tuxrules
As it says, try and see syslog or dmesg and it might give you some hints.
I'm scratching my head...
Last night I was determined to get my Zip100 drive working and when I tried to modprobe ppa it gave me a similier message, so after running the command for the millionth time(and a little research), I decided to read dmesg.
To my surprise the was a message all about how no ppa drives were detected and some newer zip drive use the imm module. modprobe imm got the Zip drive working, without any hassle.
Dmesg is very useful for debugging hardware issues.