Well usually when there is a color distortion, artifact while just being, logging into desktop, it mean the gpu is not in a good shape or the motherboard have some issues either.
i)the card could be faulty on the gpu or ram.
ii)the motherboard maybe need a bios update, driver updates or is faulty on the pci-e, power management.
iii) the card need a driver update.
iv)the psu is being old.
I would try first the gpu on another working computer to check if it shown the same behavior.