I had the same issue with my Elitebook. Turns out it didn't like one of the sticks of RAM.
If you have more than one in the Envy, try one at a time or swap them around.
Just redid that hard reset worked this time thanks guys, didnt want to have to get another one , should last mroe than 4 years or i guess thats standard now
well left it over night after switching the ram places around and seems to have come right, i feel this tempoaray though knowing my luck
one blink points to the cpu
could be anything from the cpu itself to the power regulator.
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will see how it goes for the next couple of days, my next post mat be about recommendations for laptops:)