I am sorry to hear that you are having some minor difficulties with your Samsung 2333HD.
To better address your issue and to walk you through a possible solution, please contact Samsung Customer Support toll-free at 1-800-726-7864, or visit www.samsung.com/us/support/ for Live Chat, e-mail, and Twitter support options.
I have a SyncMaster 2333HD that I am using as my desktop's monitor. Since my desktop has an HDMI out, I am using the HDMI input on the monitor instead of the PC input. My computer is a Gateway FX, running Win 7 64 bit. My problem is that when the PC is left alone for a period of time with no screen activity, or even goes to screen saver; after about 5 minutes or so, the screen switches to a black screen with the no signal box on it. Is there any way to turn this off?