Call Keysight and talk to a tech there… I’ve had good luck with them as they were able to identify who made the PSU (3rd party). At the end I was able to repair my PSU. But in your case you do need a new screen. Figuring out that the PSU in these are 3rd party, I wonder if the screen is too!? If you are able to get a new screen, then get also a new main filter cap for the PSU. Mine wasn’t the only one having a shorted main filter cap.