Good luck. I will never buy an HP product again. In fact, after buying HP printers for the last 30 years, I finally bought an Epson and a Samsung laser printer. My HP 4622 inkjet just stopped printing black ink because it has reached the end of its life after 1 year/2 months.... right after warranty. And yes HP I've been using you expensive ink so that is not the problem.
If you laptop is still under warranty, call HP service, ask for a service box and send it back to them . They will probably either replace the entire mother board or issue you another laptop. I've tried everything on this and it just seems to be a hardware defect that HP will not place on recall.