MR60 Separating 2.4Ghz and 5.Ghz

i have spent over 20 hours on tech support to try to connect HP6500e printer with MR60 router without success. I have spoken with so many people who cannot seem to help me. I had my ISP check to make sure all is correct so thats not the problem as some have suggested. Both  products tech teams have remotely taken over my computer to attempt to fix this issue, which has not helped.  I have spoken to many HP tech support people also, maybe those two companies should share data to find a solution.  I am at a loss what to do next. Do i have to return the router to the store which is 150 miles away? do I have to replace my 6month old printer that worked fine until this router installed? I have written to Netgear with no replies. I have asked what printers would be compatible with this router...no answer and my internet search said my printer would be compatible. Any suggestions? i am so frustrated.