Suddenly blank While I'm using it , suddenly it went black & the green power light still as it is. I restarted my computer , changed the power & Data cable , unplugged the data cable only But all made no effect. I tried another monitor and it works fine. I've doubts that some thing changed the monitor setting to "Input B" instead of "Input A" which the data cable is plugged to. any Idea about how to switch back to "Input A" or what is the problem ? For knowledge, I don't have any devices like "Video , TVbox ,...etc" which I can plug to "Input B".

It sounds like your monitor has failed. If another monitor works fine but this particular one is not showing any picture. I would bet that your monitor is no good. The best solution to this problem is go and buy another monitor. To have it repaired would cost almost as a brand new monitor. It sounds like your monitor has failed. If another monitor works fine but this particular one is not showing any picture. I would bet that your monitor is no good. The best solution to this problem is go and buy another monitor. To have it repaired would cost almost as a brand new monitor.

I build custom computers and I have had good luck with this one.
Samsung SyncMaster 216BW 21.6" Widescreen LCD Monitor - 5ms, 1000:1(DC 3000:1), WSXGA+ 1680x1050, Gloss Black, DVI-D, D-sub, 300 cd/m2
also sounds funny but I also use I-INC monitors. Cheaper price but in contrast good performance low temperatures. I build custom computers and I have had good luck with this one. Samsung SyncMaster 216BW 21.6" Widescreen LCD Monitor - 5ms, 1000:1(DC 3000:1), WSXGA+ 1680x1050, Gloss Black, DVI-D, D-sub, 300 cd/m2 also sounds funny but I also use I-INC monitors. Cheaper price but in contrast good performance low temperatures.