I can make 2 suggestions. First have you scanned the computer with an up to date anti malware and anti virus program? Has your anti virus been turned off? The other thing I would do after making sure I did not have a virus or Trojan would be to remove the Lexmark software and re-install it. You might consider downloading the latest drivers for that printer from the link below. Let us know what happens please. Here is a link that might be useful: Download new drivers

Davidtay, thanks again for your response. So with your input on 90 degrees, it sounds like what I have in mind should work. I also talked to the dealer, but he had a difficult time visualizing my concept. I don't know if I am being clear about this mirror/light idea as I've posted in this thread. For those that would like more information on my idea, imagine a small table top that is an inch thick. Then imagine that I wrap the periphery with a lighting strip, (like a hat band around a hat), mounting it so it will shine out sideways from the table top. This is what I want to do with an oval piece of plywood that is a bit smaller in diameter than my oval mirror. I want to mount the mirror on this oval that is mounted and hard wired to the 12v system. The result would be my mirror would have a back light that would have light shining out sideways from around the circumference of the oval plywood. So there should be no sharp bends, just a curve around. I still wonder if it would look goofy or over the top with respect to "lighting gimmicks". Just because I can do it, doesn't mean I should do it. If anyone else has any thoughts on this idea, I'd be happy to hear you.

Since all herbicides I am aware of are meant to be applied at low pressure I cannot image why anyone would want such a high pressure system. If the manufacturers instructions do not help call them.

Solve the equation by selecting your "m" and it will result in the dosage amount per gallon which would cover 1000sqft. This is a common misconception. The amount of carrier (water) per ksf is a function of the sprayer volume, not a pre-determined thing, which is why spraying requires calibration. What you do is you mark a 10x10 section of driveway , take your sprayer and a timer, and see how long it takes you to spray that 100 sq ft section. You then take a large measuring cup and spray into it for the same amount of time to see how much water it used for 100 sq ft. Multiply that by ten and now you know how much water to use per thousand sq feet. My backpack sprayer with the fan nozzle puts out 1.3 gallons per ksf. The round spray nozzle puts out 0.7 gallons per ksf, but can be adjusted. If I'm trying to apply prodiamine to 3000 sq ft with the fan spray at a rate of 0.5oz per ksf, I would add 3.9 gallons of water to the sprayer and 1.5oz of prodiamine. If I'm going to do it with the round spray nozzle I would add 2.1 gallons of water and 1.5 oz of prodiamine. The amount of water will vary based on nozzle output and calibration. Calibration has to be done every time to ensure correct application.