Half of per node 5 is down

[rotary dial tommy]

sx 2000 lightware 34 . Half of the card slots on per node 5 are down starting with slot 7 . I replaced per node power supply ,and pulled all cards cards out of node and reinserted one at a time but still have same problem . Any ideas are most welcome . Thanks 

[ralph]

When you say "down", does that mean that there are no lights on the cards or that just that all the devices are out of service?
You've already replaced the  PS so that isn't it.
If no phones then try changing the controller card.

Ralph

[rotary dial tommy]

The controller card was swapped  with cab 4 controller card yesterday no change . I should of mentioned that , my bad . Yes all leds are normal .

[ralph]

Possible bad backplane?
If you've swapped out all the cards and PS that's the only thing left I can think of.

Ralph

[rotary dial tommy]

Hi Ralph , I took a another per node this AM and all is working now . I will bring the old one back to the shop and see if I can find the fault as it was my only spare I used today . Thanks for your help .