Check your parallel port with a volt meter. When I first connected mine I was having all sorts of problems, turns out some of the pins I expected to have zero volts had 5vdc. I had to install a cheap aftermarket parallel port card and it worked fine after that.
When I upgraded that pc recently to a better pentium 4 2.26ghz motherboard built by Intel no less, that built in parallel port was even worse, there must have been 4 or 5 of the pins with 4-5vdc that were supposed to be zero. Again I installed an aftermarket parallel card and it works great.
For some reason the manufactures are powering those pins, probably for aftermarket stuff like swappable dvd drives and the like. This issue can be really bad if you are using a notebook. Test every pin you plan to use. |