Hardware Diagnostic Component Test - Touchscreen not responding.

[therearenorules]

I am helping a friend try to regain his touch screen capabilities.  He seems to think that the windows 10 upgrade stopped it working. 

I have run the Hardware Diagnostic Test (F2 on boot) and run the component check for touch screen.  There is no response to touching the screen.   This test is UEFI which I presume runs before any OS is loaded.  The display works fine otherwise.  Is there a way to know if this is a motherboard problem?  I can't find anything in the BIOS that relates to touch screen, and I can't get a log report for the diagnostic test because I can't start the test ... it just times out and the log says cancelled.  Is there a separate connector from display to motherboard for touch screen that may have come loose? 

Any help would be greatly appreciated.

[GBL84]

Dear Customer,

Please go through the below document and see if it helps:

http://support.hp.com/us-en/document/c03488148

 For any further queries reply to the post and feel free to join us again

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Thank You,

GBL84

I am not an HP Employee

[therearenorules]

Thanks ... been through all of that.

Updated bios

Updated graphic driver

Enabled/disabled/enabled HID Touch Screen in device manager

"Setup" in Tablet options won't run because touch screen is unresponsive.

The hardware diagnostic interface runs before windows loads, so it is not a Windows issue.

All other hardware tests pass.

Beginning to think it is a flex cable issue.