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HP ZBook 14u G4 Mobile Workstation.not booting up after screen freeze

HP Recommended
HP ZBook 14u G4 Mobile Workstation
Microsoft Windows 10 (64-bit)

The screen becomes garbled & completely freezes, unresponsive to mouse movement, requires a hard shutdown. Now after a few such starts, now it is not booting up at all.. The power button LED & the wifi & mute button lights come & go in 4 secs intervals.
Also tried removing the battery & all connected devices & pressed power button for more than 15 secs as suggested on HP support portal for similar issues, but of no avail. It is observed that the fan also runs intermittently along the LED lights above..



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