Samsung monitor/"check signal cable" msg

Been using this monitor for about a year and a half, connecting it to my Mac Mini with a Mini Display Port to VGA adapter.  All of a sudden, I get the "check signal cable" message.  I replaced the VGA cable; no luck.  Then I replaced the adapter; still no luck.  The Mini runs fine; I can access it over my network using my laptop.  Anybody got any suggestions?  Thanks.
Ellen

Reset the SMC > Resetting the System Management Controller (SMC)
1. Shut down the computer.
2. Unplug the computer's power cord.
3. Wait fifteen seconds.
4. Attach the computer's power cord.
5. Wait five seconds, then press the power button to turn on the computer.
and then the NVRAM / PRAM > About NVRAM and PRAM
1. Shut down the computer.
2. Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
3. Turn on the computer.
4. Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
5. Hold the keys down until the computer restarts and you hear the startup sound for the second time.
6. Release the keys.
Then it doesn't work, test the monitor with another computer and/or test another monitor with the Mac Mini.

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