Can iMac 27 late 2009 enter TDM connected to a Mac Pro late 2013?

I'm trying to get an iMac 27 late 2009 to enter target display mode when connected to a Mac Pro late 2013.
I tried with Apple's Thunderbolt cable and pressing Command + F2 on the iMac did nothing.
So I bought a Mini DisplayPort cable, and now Command + F2 makes the iMac's screen turn black for a second and then back.
After rebooting, before logging in, if I press Command + F2 it actually works for about 2 seconds and then back to the iMac's screen. After this, if I keep trying it just flashes black.
So, my question is, has anyone managed to connect this two devices?
Should I buy another cable? Format the iMac? Any suggestions?
Thanks for the help.
OS X Mavericks 10.9.4 on both machines.

Thanks for your help.
I don't know what more I can add to the initial post.
The second Mini DisplayPort cable that I tried is Belkin, I don't think there are better cables for this, since Apple is not selling it anymore.
I did mentioned that if I restart the iMac, before logging in with any user, pressing command + F2 or simply connecting the cable will actually work, it shows up as a second display on the Mac Pro, I can move the mouse pointer on the iMac. But after about 2 seconds the iMac exits Target Display Mode, and after this pressing Command + F2 will only turn iMac's monitor black for about a second and not entering TDM anymore.
I even checked the firmware versions and both are up to date according to this.

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