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HP Recommended
Elitebook 820 g1
Microsoft Windows 10 (64-bit)

I have an Elite book 820g1, product id J7A41AW#ABA, which will not boot up. When I press the power on button, there is a brief light in the CapsLock key and power light on front panel changes from white to amber and blinks 3 times.
Before this started, I had been trying to refurbish/renew the pc. It came with a regular SATA hard drive plus a small solid state hard drive on a card located just above and to the left of the memory slots. The notebook had been running previously on Windows 7 but I wanted to do a clean install of Windows 10 professional.  The install formatted the SATA hard drive but windows install would not install on that hard drive until I removed the solid state drive and removed the raid setting in the bios. Windows then installed and the pc was running fine for the next few days. I left it for about a week and when I tried to use it again I get this problem with not booting up.
I've checked various HP websites and downloaded the latest bios. I did the bios install to usb drive and inserted in a USB drive on the 820g1 and followed the instructions - power on holding down Windows and B keys.   However, I get the same results - light on caps lock briefly, white power on then amber and flashes 3 times.

I've downloaded the 820 service manual and done a lot of searches but I can't find anything specific to this model to explain what the 3 flashes mean or how to fix the problem.
Is there any way I can get the pc working again?

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