After hundreds of remote fix sessions, these are the errors that come up again and again.
When a workflow breaks, most people guess. Here's the systematic decision tree we use in real support sessions.
Bought a 5070 Ti, 5080, or 5090 and ComfyUI won't start? Here's exactly what's different and how to fix it.
Your GPU is there, but ComfyUI refuses to use it. Here's every reason torch.cuda.is_available() returns False.
ComfyUI plugins fight over numpy, pillow, and torch versions. Here's a real-world guide to finding and fixing dependency hell without nuking your environment.