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support.hp.com
Computer is a low budget unit.
Intel® Celeron® N4000
4 GB DDR4-2400 SDRAM (1 x 4 GB)
32 GB eMMC
discharge unit; hold power button down
extract battery and power cord, extract RAM and discharge again
replace power cord
if the unit still doesn't post on external display, then replace laptop or replace mobo if spare is available.
Verdict for IT Pro's:
recommended solution, replace entire computer with upgraded unit with faster CPU and more RAM