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Repair Guides for HP Desktops.

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HP EliteDesk 800 G2-Tower failed memory initialization

I got this old HP EliteDesk 800 G2-Tower PC from the scrapyard and I don't know if it worked before, but I assume it did. There was no CPU and no RAM in it when I found it but I also have multiple i5 6500 and 2x8 GB RAM. I tried every CMOS/BIOS reset option and also different CPU/RAM combinations. I always get 3 red und 2 white led blinks which according to this means "The embedded controller has timed out waiting for BIOS to return from memory initialization" and I don't really know what to make from that. The motherboard has a green led that lights up and the CPU also spins up when I connect the PSU.

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When I used my pc 20 minute my PC is shutdown automatically

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What do you mean? Do you also get three red and two white blinks?

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crwdns2933897:0crwdne2933897:0

Hi,

You might consider downloading a BIOS update for it to see if flashing the BIOS will resolve the hang.

Download BIOS and create a USB boot disk to run the BIOS Update.

Hope this helps

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I created a drive with "HPBIOSUPDREC64". Unfortunately, the PC doesn't "react" to a USB drive with the BIOS update on it, and it still blinks immediately after turning it on.

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Hi @leo9444

Just verifying that by "...every CMOS/BIOS reset option..." you also tried resetting the BIOS by disconnecting the power to the PSU, removing the coin cell battery from the motherboard and then pressing and holding the Power On button for 20 seconds, then reinserting the battery, reconnecting power to the PSU and turning the PC on to check if this resolved the problem?

If it did, if the coin cell battery voltage is <2.5V DC or the battery is >4-5 years old, replace it.

If you did and it still didn't work here's the schematic if you're interested.

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Yes, I tried exactly that and also replaced the CMOS battery. Thank you for the schematic, maybe I'll take a look and do a few measurements..

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