When I see this I try the monitor on another PC first. But you have 2 so the test is only to be sure.
The 2333sw came out in 2008 so I would not repair it.
My Samsung SyncMaster 2333sw keeps flashing on and off intermittently. It loses video and acts like there is no signal and the power light goes off as well. I have replaced the capacitors in it already and rules out the video card as I have 2 monitors and only this one does it, regardless of which port on the card or cable I use. Any idea as to what it could be and how to fix it or is it just junk at this point?