This sounds like a full brick, sorry. Be sure to read
OH SH*T: Black Screen of WII!!! and test all your options.
I suspect you downgraded from 4.2 to 3.2, then upgraded to 4.1. If this is the case you have ios60-v6400 which is a useless stub, installed with system 4.2. System menu 4.1 required ios60-v6174, without it the wii will not function.
If you had boot2 bootmii, it could be fixed but you don't. Don't feel bad, most are not that lucky.
If you made a nand backup you could use an infectus nand programmer to reprogram the nand. Big job. You could also sell the wii to someone with some infectus experience if you have a nand backup.
Sorry, best of luck