Out of dozen printers, 4 stopped being able to print. They are set-up on a Windows 2K8R2 sever and shared from there.
I'll use the little HP LaserJet Pro 400 as an example....worked fine for several weeks. Now it is unable to print. I can ping to it, can access its web interface but that's it! Looking at the back of it, I can see that its network card is showing a steady green light (normal) but the yellow light is blinking like crazy. It's the same issue for my other 3 printers (Konika Minoltas)....the yellow light on their network cards is also rapidly flashing non-stop.
Any ideas as to what could be causing this.....before I run out of hairs to pull off of my head?