Or maybe there’s a fault with the SNAIC5. Having the link plug would help in the diagnosis.
You can get a link plug from a Naim dealer or online from Tom Tom audio. Any chance you can take the kit back to where you bought it from and get it checked out ?
Also, if it has been couriered at all then it could be that the internal daughter boards have come loose in the NAC72. If you unscrew the feet and carefully slide out the inner sled (be careful of the fascia when you do this - it can chip easily) you can then check to ensure each board is properly located.
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It’s worth undoing the plugs to check that all the wires are connected to the pins.
thanks, all was a private sold as seen sale so can’t take them back, but that fine I’m sure ill work it out. Ive checked the boards they are all seated albeit somewhat loose some of them, and the connector looks ok to the din. I wonder if some of the caps have gone which is a bit beyond me…
The boards will appear a bit wobbly even when securely plugged into the main board. Even if caps were suspect, i’d still expect the display to come on so i expect the issue is elsewhere. Definitely try the 72/140 only (with a link plug in) and also it’s worth checking that the SNAIC5 and 4 are genuine Naim items. Have a look in the connection guide here
Curious, if it came with a hi-cap then it doesn’t need the link plug…
More likely to be a blown fuse in the hi-cap or NAP 140 IEC plug drawer, easy thing to check : )
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thanks have checked both they seem ok, both light up. In fact when I have the three in sequence there is a significant hum…thats the 72/hicap/140
Which input have you connected a source to and what is it?
Perhaps stating the obvious but do not connect a line level source to the phono input and potentially the aux input (you may have a 5 pin DIN CD input rather than Aux) - both could be customised with the drop in boards mentioned earlier which as noted might have come loose in transit - the case is pretty easy to open, worth checking what the boards inside are.
The 72 is a fine pre even if you need to get it or other parts serviced.
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Your best course of action is to get somebody to look at it who knows about Naim - a long established Naim dealer would be a good bet.
yeah will do, thanks for all of your help
Darran at Class A Sheffield is highly recommended 
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Is the HiCap an early unit maybe an upgraded CB to Olive case as socket 3 has the 24v supply to the pre amp but to power the 72 use socket 4 and plug amp into socket 2
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If it does have a the single rail 24V on socket 3, note that you will still need the link plug to be fitted to the NAC72 in order to use it.
Just as a question, how is the Naim link plug for the 72 configured?
Could crohamblues make a suitable link using a blank din plug?
Thanks
Very bad idea. Too easy to cause damage this way. A new replacement link plug is inexpensive and easily available.
Yes, it was to get an idea of the bridge used in the Link plug.
Sorry for the bad idea… 
So I picked up the boxes for all of my Naim kit and for my Linn Sondek today. The plug was in the box… low and behold, as advised above, the 72 works with the plug powered from the 140, so I wonder if its simply and issue with the SNAIC5… TBH and forgive my limited understanding, what is the purpose of the HICAP when it appears to work perfectly well with a 72/140 combo…
thanks for all of the advice BTW, I also picked up some Naim SBL speakers, which also have an issue im going to start another thread about…
That’s good. At least the 72 is healthy. It could be a problem with the SNAIC5 or the Hicap. Can you borrow another SNAIC5 to try and rule yours out ?
Reason for the Hi-Cap ? The 140 can provide a single 24v rail to the 72 but this supply shares the same transformer as the power amplifier section. A Hicap can provide 2x24v rails to the 72 and its transformer is dedicated just to provide power to the regulators providing power for the 24v rails.
thanks.