I purchased a HP 250 G7 a little over a year ago. It has been used for less than 100 hours. It cost over £600. It has died.
It is out of warrenty, I've attempted to fix the problem by replacing apparently faulty ram. A nice chap on HP forums tried to help. Sadly to no success. The fault error is faulty ram. Now with 5 sticks seperately tested in both slots I know that was a lie.
It is just e-waste now.
Don't trust them.