I haven’t submitted here before, so sorry for my lack of precision. Everything was fine, Comfy updated, now nothing works. Reinstalled, same problem.
same,but I update the NVDIA drivers,it work
On Mac Sequoia 15.5 doesn’t work either. I reinstall the shole thing but still doesn’t work
Unable to start after I update to latest version, try to reinstall 5 times still the same. It’s said that the error about Pytorch, python, and venv. try to clear cache, re-package python, shut off windows defender and firewall still the same.
I don’t have programming background so I’m sorry for my lack of precision
Thank you for the advise. I tried it, but still not functioning.
Me too. Have spent the last 4 days on this. Uninstall/reinstall loop but still won’t start.
Was able to fix my issue with the Unable to start ComfyUI v0.8.23. I’m running Windows in a laptop RTX 5070ti and used these commands in PowerShell to manually install pyTorch CUDA 12.8. Just correct your “User” path in the command before running it. Hope this helps you all.
# Activate the ComfyUI venv
C:\Users\User\Documents\ComfyUI\.venv\Scripts\activate
# Uninstall CPU torch
C:\Users\User\Documents\ComfyUI\.venv\Scripts\python.exe -m pip uninstall torch torchvision torchaudio -y
# Install CUDA 12.8 torch
C:\Users\User\Documents\ComfyUI\.venv\Scripts\python.exe -m pip install torch torchvision torchaudio --index-url https://download.pytorch.org/whl/cu128
# Confirm Cuda is running
C:\Users\User\Documents\ComfyUI\.venv\Scripts\python.exe -c “import torch; print(torch.cuda.is_available()); print(torch.cuda.get_device_name(0))”
And you should get an output of: True
NVIDIA GeForce RTX 5070 Ti Laptop GPU
1 Like