HP Envy desktop won't boot at all

[Plaken]

The desktop won't switch on at all. Checked the following:

- Power cord is OK

- Power outlet is OK (other devices connected to it are working)

However, the weirdest thing is that the green power LED at the back is ON despite me disconnecting the power cord and holding down the power button for >10 seconds. Also, no fan sounds or beeps heard even after holding down the power button. Earlier I used to hear a distinct click when doing so.

Is my power supply borked? If so, is there a specification for the power supply that I must ensure if I want to replace it?

Thanks.

[Grzwacz · Accepted solution]

Hi,

It sounds like the power supply is in trouble. A standard ATX power supply (150 × 86 × 140 mm (5.9 × 3.4 × 5.5 in), will work in your PC's chassis. You could start here since it is as good as any place to start.

But, the cause could be any component connected to the power supply.

Troubleshooting the bad part requires checking connections, reseating connections and components, and replacing components until you eliminate the problem. Check existing components/connections before you start replacing stuff. Replacing stuff is expensive. Your PC is not a spring chicken.

I would replace the CR2032 MB battery to reset CMOS (an inexpensive troubleshooting step). Then try using onboard graphics by removing the discrete graphics card. Try one stick of RAM in each memory socket. 

Reduce the PC to a minimum configuration: disconnect SATA devices, front USB 2.0, 3.0, and front USB card reader. Disconnect WIFI if applicable. Do one thing at a time. Start the PC to check for a good POST as you go.

Now you have to replace components: replace the power supply, try different, known good RAM, replace the CPU, replace the MB.

Regards

[Plaken]

Hey Grzwacz,

Thank you for your quick reply!

I spoke to HP Support and they performed diagnostics with me. They recommended I change the motherboard. However, since there is no activity in the power supply (not even the fan starting), I will start by replacing the power supply before moving on to the motherboard, if required.

Cheers,

Kanwar

[Grzwacz]

Hi,

You're very welcome.

Hopefully the MB and CPU are okay.

Finding an exact replacement MB may be difficult.

Regards

[Plaken]

Thanks again. Luckily, HP Support does have matching MB (for now). I'll start with the CMOS battery, then power support, MB, and so on 🙂

Cheers.