OMEN 30L Not Posting

[Robster11th]

I have a Omen30L i9 3070RTX :

I tried upgrading the Factory RAM from 16GB to 32GB DDR4 from another PC that I have - When I first booted, its beeping 3 long and 2 short so its referring to RAM, then I when I put the old memory back its no longer posting and just powers on and off for 5 seconds then repeats. Figured might need a BIOS reset,  tried taking the cmos battery out(5mins) to reset bios but still no luck, any ideas?

I tried reseating the GPU to isolate but no go, I dont want to reseat the CPU as I have no thermal compound at the moment.

Im confused if I hit something while removing the old ram and putting in the new one. I have reseated all power cable goin into the mobo and fan/aio. looking at everything all rgb leds light up and turn on for a couple of seconds then turns off. chasis fan aio and graphics fan all turn on but resets at after 5 seconds. Im looking to clear the cmos pins manually which I saw underneath the GPU but wanting more information before I do it. I cannot find the manual for the Dorado OC board Rev B.

Any Ideas how to bring this computer back? Also I have no extra GPU to check if its a GPU issue and the builtin mobo has no igpu so thats a no go as well.

[Bill_To]

Greetings @Robster11th 

Welcome to the HP Forum.

It never hurts to replace the CR2032 MB battery when troubleshooting. It's inexpensive and easy to do.

The PC is now power cycling using the original HP factory RAM. That's usually a power delivery problem (power supply, MB, CPU, memory, or a different component is in trouble).

Remove the HP memory modules from the MB. Then visually inspect the HP memory modules and the MB memory sockets for any damage. Then try each HP factory memory module, one at a time, in each memory slot to see if the PC will POST.

You reset CMOS by removing the MB battery having no luck. I can't say doing a CMOS jumper reset will produce a different outcome.

It sounds like you checked all cabling and MB connections.

Finding HP MB specifications is very difficult these days. Many HP MB support sites are non-existent or broken.

The only way, I'm aware of, to solve this problem is to run the PC in a minimum config. A minimum config is:

- Power supply

- Each stick of HP memory, one at a time, in each memory slot

- Graphics (discrete graphics card or try onboard CPU graphics if available).

- CPU

- MB

Then, if the PC will not POST in a minimum config per above, you methodically replace components, one at a time, using known good components, until the PC will POST.

In some cases a fix does not occur until you replace the MB.

Replacing components is expensive. I usually recommend using a local PC Tech when you have to swap in core components.

A very unusual wild card cause when the PC power cycles could be the Front_Panel (F_P) power button. One way to test this, if you feel comfortable doing this, is to disconnect the F_P power connector from the MB F_P power header when the PC is disconnected from AC power. Now connect the PC to AC power and short the MB F_P power header pins using a screwdriver to check for a POST.

Regards

[Robster11th]

Thank you @Bill_To 

Update: I have revived the desktop. cleaning, re-pasting and reseating the cpu onto the AIO helps and was able to boot normally except for the usual BIOS error due to the reset. but all is good now. Now it looks like the RAM I have is incompatible. I just read more on upgrading an Omen30L ram and didn't realize that the motherboard is somewhat restricted by HP for certain timings. My bad for not looking it prior the install. 

[caedric]

Clear CMOS using the jumper pins,Try 1 RAM stick at a time,Double-check all power cables,Make sure RAM is fully seated,Avoid touching CPU without paste.If it still loops, motherboard or RAM slot may be the issue.