2013 27'iMac wont stay in TDM

I have two 2013 27' iMacs linked via TB cable. I am attempting to use one to the iMacs as a secondary display. However, the taget iMac goes to sleep after only a few minutes and drops out of TDM. initially I thought it may be a simple energy saving problem but I have reset this several times and the problem does not occur when the iMac is not in TDM.
Any suggestions as to how I can get this second iMac to hold in TDM would be greatly appreciated.

Hi BDAqua
Many thanks for taking the time to assist me.
Intel-based Macs: Resetting the System Management Controller (SMC)...
http://support.apple.com/kb/HT3964
I opted for this as my first response but had no luck.
Have you done a PRAM reset, CMD+Option+p+r...
http://support.apple.com/kb/HT1379
In fact, do 3 in a row, takes a bit of time.
This seems to have solved the problem - both machines have been running without issue for the past few hours.
I am new to the world of Macs having been a DOS/Windows user for several decades and only just recently made the switch. The somewhat opaque world of Macs has been a little trying but interesting.
Many thanks for your assistance in solving this issue.

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2013 27'iMac wont stay in TDM

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