Z97M GAMING no hdmi signal with DVI converter

My monitor has VGA/DVI only (Samsung SyncMaster 213T), I have a HDMI to DVI converter in the DVI port, this works with the HDMI out from my laptop.
Am putting together a Z97M/4790K rig. I get no signal at the monitor from the Z97M's HDMI out, if I connect it to a TV I do get a signal.
Am using the same (short) HDMI cable and adaptor with both the laptop and the new Z79M, used the same cable to connect the Z79M to the TV.
So the cable and converter are good (they work with the laptop) and the Z79M HDMI port and cable are good with the TV.
Anyone have any idea why the Z97M HDMI output wont display on my monitor? (Any bios settings to make the HDMI signal more compatable?)

Yes, to be clear, there is no GPU. When I say the Z97M's HDMI out I mean the output from the Z97M motherboard. I have tried it with a second screen, the TV (it worked).
Logically one of two things must be happening... either the Z97M's HDMI signal isn't making it through the DVI/HDMI adaptor (when the laptop's signal is), or the monitor cannot process the Z97M's HDMI signal (when it can process the laptop's).
HDMI and DVI signals are the same, so the adaptor is just a plug converter ('square plug in round hole') and unlikely to be the issue, especially as it works with the laptop.
But both the monitor and laptop (which work together with HDMI and the DVI converter) are >5 years old. The Z97M is very new and could be it's HDMI output just isn't compatable in some way with the (relatively) old monitor.
Hence am wondering (for example) if there are any Z97M bios settings which might make it talk nicely to the old monitor.
Be interested to hear if anyone has had issues (or even success!) using the HDMI out with DVI monitors, especially old Samsung SyncMasters ?

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