Hello! I was having the exact same issue as you with very similar circumstances. I had modded both of my wii's several years ago, and I wanted to update the HBC and priiloader. I had a very similar situation where my wii would not launch any title, go to the HBC, or even return to the system...
I may try the new ram site, and download more RAM to my Switch. Not sure if ddr3 is the right ram
for it tho. Edit- no it uses floppy Ram, just like @AncientBoi