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Welcome to Justanswer.com, my name is Dustin.I'm sorry to hear about the issue you are having, I will do my best to help you resolve it.
If HP worked on this directly and couldnt solve it, then most likely its not going to be a simple " click this and then click that" type of fix.
It may be a bit simpler and easier if you and I connect through a secure remote assistance. With that, I will be able to connect to your computer from here and work on repairing the issue personally. This can save a lot of time.Our secure remote assistance is guaranteed meaning if I cant solve the issue then you will be entitled to a full refund of all fees. Would you like to try a remote assistance session or would you prefer to continue via written support alone?Thank you for your response,Dustin S