How do I troubleshoot if my HP TouchPad stops functioning?
To troubleshoot a non-functioning TouchPad on your HP notebook, disconnect the system board cable from the TouchPad button board ZIF connector (1) and the TouchPad cable from the system board ZIF connector (2), then reconnect them to ensure they are properly seated. Also check if there is any debris or obstruction preventing proper contact between connectors. If issues persist, consulting with an authorized service provider may be necessary. (Page 47)
From the official HP 250 G7 Notebook PC manual, page 47
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