Has anyone encountered, and been able to fix, an iMac 2011(mid) 21.5" logic board that allows the system to boot up completely, has Ethernet, Thunderbolt and FireWire available, but that has a dead USB Hub (rear ports), SD Card does not show up in the System Profiler, Wi-Fi and Bluetooth also not being detected by the system? Any light that can be shined over this matter would be great. I also do not think it is related to water damage as there is no signs of it anywhere.
I have tried baking it, and cleaning what looks like corrosion with alcohol to no avail.
Thanks up front!