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Flashing white LED on power up

HP Recommended
HP EliteDesk 800 G1 Desktop Mini PC (ENERGY STAR)
Microsoft Windows 7 (64-bit)

Hi there folks.


We have an HP EliteDesk 800 G1 Desktop Mini that when we try and power it on  flashes 1 white on the power button followed by 1 white flash on the HDD light and a solitary beep. 
Checked the BEEP codes and LED diagnostics but cannot find this combination of lights and beeps in there.


Any advice gratefully accepted.

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