Replace the NiMH battery pack and console will not initialize

I bought a used Bionx 250W NiMH kit, the kit worked but the battery would not take much charge, 6yrs old. I have replaced the battery pack, fully charged the battery pack, but the console will not turn on. I reopened the box and there is power to the board, the fuse is good and power is getting past it. Any ideas on the possible problem?