Hi
Here are the steps to contact HP for phone support.
Contact HP:
Step 1. Open link: http://h22207.www2.hp.com/us-en/contact-hp/
Step 2. Enter Product number or select to auto detect
Step 3. Scroll down to "Still need help? Complete the form to select your contact options"
Step 4. Scroll down and click on: HP contact options - click on Get phone number
Case number and phone number appear
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I hope this helps, and have a great day.