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The reason why your monitor might not be recognizing a signal is because the graphics card in your pc might not be correctly plugged into a pci slot or your internal graphics may have a short somewhere. If the monitor turns completely off after it cycles Then it might be an internal problem with the backlighting in your monitor screen
Sounds like either the Monitor is bad or the Video Card is bad. Try plugging another monitor on the computer and if it can't show a display then more than likely the Video Card is bad. If it shows on the monitor you just plugged in, then the original monitor is bad.
I suggest your try a different outlet, if your using a strip, try connecting it directly to the power outlet. Also most of the monitor has the same power cable as the computer, try swapping the power cable and make sure only the power cable is connected to test the monitor. If still doesnt power on, call Dell and have it replaced if still has a warranty if not, repalce the monitor.
I just resolved this problem for my SyncMaster 913N.
It seems to be a known issue, however it can take quite some time for the problem to occur. In my case about 3,5 years, so well out of warranty.
Short term solution: unplug your monitor from power. The switch on the front is not good enough. Pull the plug and leave it for an hour or so (all night if you can). Good chance the monitor will work next time you power it up.
The problem will is likely to come back..
Permant fix requires some basic soldering as per this video:
I just managed it and it has been ages since I soldered a resistor so you may very well be able to do it. I spent $25 on tool and part and saved me from buying a new monitor.
easiest way to solve this problem. go to call settings and TTY mode. and switch it to TTY + talk ... if that doesnt work then fiddle around with the other TTY settings untill it does. this disables the earpiece