Optiplex 5055 Wont boot after Ryzen 7 1700

Question

I purchased an Optiplex 5055 which came with a Ryzen Pro A8-9600 and 4gb of ram. I booted it up and it had bios revision 1.11.0 and was fine.

Then I put a Ryzen 7 1700 (NOT PRO) into it as well as another 8gb ddr4 2400mhz ram into it to which the computer would no longer boot. The power led would flash amber 2 times, pause, then 3 more. Documentation would have it that the computer either has a faulty motherboard, cpu, or ram.

1. I know it cant be the motherboard because it was fine before the upgrades.
2. I know it cant be the ram because I swapped them in and out and around and would not post either way.

3. This leads me to the CPU; but there are benchmark results showing this computer paired with a ryzen 7 1700 NON PRO.

The cpu in question did not have any bent pins and the seller said that it worked. So I'm at a loss. Is there possibly another explanation for what is going on here?

bradthetechnut · Accepted Answer

Optiplex 5055 Spec SheetPut the configuration back the way it was.  Does it now boot?Changing 2 or more things at a time isn't recommended.  What is recommended is one thing at a time.  For example, try the new RAM and see if it works.  Then try the new CPU.Do all of the RAM specs on the new RAM match existing RAM?  Do you have 4 DIMM slots?  In which case, if you have 2 sticks of RAM, populate by using matching tab colors.  See how the tabs that hold the RAM in place are either black or white?  Populate the black channels first and then the white if you have more sticks.I see the CPU you bought is used for the 5055 on Userbenchmark.  However, I'm not seeing it listed on the spec sheet; the PRO version is.  Either the Ryzen 7 1700 is hit or miss, or it's incompatible, or you received a defective CPU.  RAM isn't ruled out yet though.  You'll have to try it with previous CPU.

TheBass01 · Accepted Answer

@TheBass01​ Update: I found a guy on youtube who bought a Dell Optiplex 5055 that came with a Ryzen CPU (not APU). His model was 00NNT0. And as it turns out that is the model of the motherboard that I purchased. Will update later.

bradthetechnut · Answer

Did the seller you bought the CPU from have something for a return policy?

TheBass01 · Answer

On the contrary, I’m going to opt instead to purchase a ‘Ryzen series’ dell motherboard instead. Even if I could brute force the Ryzen series bios, I guarantee you that it isnt designed electrically to handle the more powerful cpus.

Just let it be known that there are 5055’s made for Amd A series Apus and Ryzen cpus seperately.

bradthetechnut · Answer

Your 5055 is a bit of a learning curve for me and I never stop learning.  How do you tell the difference between APU and CPU?  I did suspect APU since it has an A8-9600.

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Optiplex 5055 Wont boot after Ryzen 7 1700