Printer connection problems.

A recurring problem involving my MacBook Pro and my two printers, a Brother and an HP.

When I first got the laptop, I could only print if I turned the printer off, then on again.

After a few months, the problem miraculously fixed itself, and worked fine for several months.

Now, the problem has returned.

Have turned computer and printers off, then started Mac, then printers, no help.

Help!

Thanks,

Rick Gevers