Been doing this for years, and nothing pisses me off more than seeing people nuke their entire ComfyUI install the second they hit a red node, or just spam the Try Fix button. That IMPORT FAILED summary line isn’t the root cause—it prints after everything’s loaded, just tells you which node died, not why.
The real issue is further up in the startup log, in that Python traceback. Nine times out of ten, it’s one of three things: a pip dependency not installed, NumPy version conflict between old and new, or some node’s install script silently swapping the CUDA PyTorch for the CPU version.
Scroll up to the first error, look for the line starting with the error name, and you’ll know how to fix it in thirty seconds. Stop messing around, just read the damn log.