Today I wasted hours trying to get my Cintiq monitor to work. My PC was not displaying the monitor. It did not even recognise it. I would start up windows and it would appear to be working until the Windows screen finished and then a box with "no sync" would quickly appear and then another saying "go to sleep". FRUSTRATING!
I scanned the Internet and everything I tried did not work. I change resolution and turned my computer on and off, reinstalled the software and the driver. I did find a solution. I swapped my monitor leads around and turned my computer back on and it worked. My computer discovered the Cintiq once again and instead of the "no sync" message I got a "configuration" box.
I thought i would share as I found many frustrated people looking for an answer. Good luck to those who find my post on the "no sync" + "go to sleep" error issue.
At least I can make a start after dinner maybe :-)