Chosen Solution
There is no video card to replace, you’d have to replace the entire logic board… the #4led means that your video card & display are(or in your case aren’t) communicating. Also the fact an external display does not work tends to point to the VGC(VPU) as being at fault. Maybe your homeowners insurance will pay for repair or give you something towards a replacement machine. ‘‘If this answer was helpful please remember to return an mark it Accepted.
