I felt compelled to write a few lines and thank you for the great service that you provide. A few days ago, my HP 4M broke down with a 50 Service error message. I had no idea what that meant other than big bucks to repair my printer or buying another one altogether. I contemplated my options for a couple of days, then decided to see what info I could find about the problem on the web. I did a quick search, and TriStar Copiers came up. Your explanation of the problem was sooooooooooooooo concise and clear, that I decided that I was going to give you guys a try.The technician that came was very knowledgeable and the services provided was exceptional.The way I see it, TriStar Copiers have saved me at least four or five hours of time searching for a reasonable repair service and taking my printer to their shop. I am sure that,I would have had to pay a lot of money to get the printer working again.TriStar Copiers diagnosed the problem for me and the printer was fixed in no time.TriStar Copiers are AWESOME!Thank you, thank you, thank you.Regards,Frank