Hp elite book 820 g3

[Squashyball]

Hi

Hope someone can help..

When I turn on my laptop the keyboard flashes and there is a blank screen. 

[EddyK]

Hello @Squashyball,

Welcome to the HP Support Community.

Try the UEFI Diagnostics tests to see if anything comes up: 

1. Turn off the laptop
2. Press the power button and repeatedly press the Esc button
3. Select F2 (System Diagnostics)
4. Select the desired language
5. Select System Tests

Note that the above steps may vary depending on the configuration and some tests may not be available.

Also try a power reset:

1. Turn off the laptop
2. Remove any external accessories
3. Unplug the power cord
4. Remove the battery (only if it is external and removable)
5. Hold down the power button for at least 15 seconds
6. Reinsert the battery if it was removed
7. Plugin the power source
8. Attempt to turn on the device

Just to clarify, is it the entire keyboard flashing or just certain keys? 

[Squashyball]

Hi

Tried the first method but nothing happened..

Battery is sealed.

Whole keyboard is flashing 

At front all three lights are flashing then first two then third light on its own. 

[EddyK]

Ok, can you hear the fan spinning when you press the power button? Also, can you sense the backlight of the display turning on? The screen might be black but you'll most likely be able to see if the backlight is either turning on or is just off the entire time in a dark room.

Also, when was the last time you charged the laptop? If you plug in the AC adapter, what are the colours of the LEDs at the front of the laptop? What happens when you try to turn on the laptop with the AC adapter plugged in? 

From the current symptoms and from reading the Maintenance and Service Guide for this device, the issue might be power-related.

[Squashyball]

Hi

Plugged in charger it came on and started loading a bios warning appeared for 1 second  and screen went off then there was a long beep and 2 short beeps for about 10 seconds now it has a blank screen a light on f11 key and all lights on at front and I can hear the fan

[Squashyball]

Hi sorry and the caps lock is flashing two long beeps and two short beeps.. 

[EddyK]

According to this document, we have a BIOS issue:

Light and beep pattern	Component tested	Error condition	Troubleshooting steps
2.2 (blink)	BIOS	The main area (DXE) of BIOS has become corrupted, and there is no recovery binary image available. (Also happens when updating the BIOS.)	Perform BIOS recovery with external media (USB or CD-ROM). Go to HP Notebook PCs - Recovering the BIOS for additional information.

Could you try the various methods listed in this document?