Program to stop Monitor sleeping

Hi, I have 2 dell 2415 monitors. I run them from my gtx 670. But one monitor will sleep if it is inactive, whilst the other is fine.

So, I need a program or maybe something in task scheduler, that can run in that monitor just to trick the monitor into thinking it is active. Something lite.

The energy saver thing is built into the monitor and you cannot modify it.

BTW someone had the same problem here: GeForce GTX 670, Dual U2415, ignores desktop powersave options, powers down - Desktop Video - Desktop - Dell Community but failed to post a resolution.

Any ideas would be great,

Thank you.

Just trying caffeine program. Wondering whether it will make active both monitors or just the main one. I can switch the cables and make sure the sleepy screen is the one caffeine is working on!

Will update.

Caffeine does not stop monitor starting energy saving mode and powering down.
Stuck. Please help.