Dell printer only working on  3Com managed switch

I have a Dell 2150 network printer with a static IP that for some reason is only working on a 3Com Superstack II managed switch
   The Dell printer has been plugged into a 3Com managed switch that I found hidden in an overhead ceiling panel which connects via a CAT5 run to another 3Com managed switch going into Windows 2012 server standard R2.
 The 3Com switch on the printer side, needs to be replaced per my supervisor. I purchased a nonmanaged 24 port gigabit switch and put it in place. I then moved all inputs over to the new switch with each input in the same input jack as it was  in the 3Com switch.  As soon as I did that, none of the client PCs on the network could access the printer from that point on. I put the 3Com switch back in place coming off of the new 24 port gigabit switch uplink port, and the printer  was instantly available to all the client PC's again.   I removed the 3Com switch and plug the printer back into the new gigabit switch and lost the printer again.   Hoping for a fairly easy result of this experts. Thanks.