Black screen on boot with caps lock and num lock blinking 5 times.

[Mc7828]

I tried switching on my laptop hp elitebook 735 g5 notebook. It's showing black screen. Then caps lock and num lock led blinks 5 times after the fan start running.

[banhien]

@Mc7828 

Please try a hard reset and see if it works.

• Power off your laptop,
• Remove the a/c adapter, battery and everything that is attached to your laptop,
• Hold the 'POWER' button down on your laptop for about 10 seconds,
• Plug in the a/c power supply (without battery) and power on.

Regards.

[PARTSC]

I've same issue with my ZBook 15 G3 Laptop... I just started my laptop was working fine under very Minute load like downloading a file... suddenly windows 10 blue screen error message covered content saying your PC need restart like that... Then I tried to turn my laptop ON but unsuccessful... Caps Lock and Num Lock blink 5 times CPU/GPU Fans spin but no Display... I've tried many available solutions on internet... Like tried to restore BIOS, Installing BIOS from USB from recommended methods etc... Then unwillingly opened lid properly using proper tools unplugged Battery, 2-3 min of pressed Power button unsuccessful... cleaned RAM but unsuccessful... Then again CMOS battery unplugged and power button formula again unsuccessful... Removed heatsinks cleaned excess thermal compound and connector of card cleaning by isopropanol etc again plugged all interfaces unsuccessful... Again tried without SSD and HDD but unsuccessful... I also tested temperature by simply touching heatsink which heats up very little bit higher as compared to OFF Stage which in my opinion is normal... SSD few chips also increase temperature on start-up which in my opinion is common in high speed and performance electronics components.... So any recommendation or HACK you think may help me to put my book in work...