I have an HP ENVY Desktop
Never had an issue with it or anything unusual at all.
I let Windows 10 run the latest update and went to bed. Next morning black screen non-responsive. I reboot. No beeps at all at start up. All peripherals power up, but screen never switches from blank\black then the monitor flashes No connection. or something like that, (It is a monitor message, not from the computer or OS as it never boots.
A local computer shop guy looks at it briefly and tries a different power supply then tells me the motherboard is bad. This may be true but of course I am hesitant to believe it of course as it seems to me the board dying at the same time Windows tried to do an update would be a mighty big coincidence I think.
So I go home and walk through all the possible trouble shooting steps on the HP site, here and elsewhere.
All the options for safe mode, boot to bios, try booting holding diff keys down,reset BIOS, remove battery, remove all peripherals and internals, remove video card, remove memory, remove video card try different cab;e, monitors, etc., etc.
Here is what I am left with so far. When I boot with everything removed, including the 4 DDR4 memory sticks out, at start up the computer produces 3 long beeps, then approx a 1 sec pause and then 2 higher pitched beeps. This repeats 4 or 5 times then nothing.
When I add 1 or more memory sticks (in any order or in any slot, I tried different configurations) then start the computer, the power button light comes on, all fans start running, but no beeps and no other response. Connecting the peripherals, I hear the DVD try to spin and with USB thumb drive plugged it, it lights for a second. No other response than that. I have tried sticking in a Windows recovery boot DVD and on thumb drive but zero response from the computer.
So am I most likely looking at a dead mother board?
I've read a lot but seem to see conflicting information on the meaning of those beeps with the memory removed. Some sites say if the board produces any beeps at all that means my CPU and board are good. Is that really true?
I cannot find information specific to HP on the 3\2 beep sequence other then generally pointing at hardware \ memory. I have no other memory sticks to try but if by chance it is memory related the odds on all 4 sticks going bad at once don't seem possible.
What re the chances the failure and the Windows update timing are a coincidence?
Any further thoughts or suggestions would be appreciated before I buy a replacement board.
Here are specifics:
The HP computer:
HP ENVY Desktop - 750-247c with VIDIA GeForce GTX 745 (factory refurbished)
Purchased in fall 2016 (and of course out of warranty now)