No post after cpu upgrade for 590-p0076

[LiquidSnek]

Hi, I was trying to update this 590-p0076 to be windows 11 capable. The Ryzen 2200g it had is apparently not supported by Win 11. So I got a Ryzen 2600 which I believe the mobo should support. I also did update the bios beforehand just in case. And figured I needed a discrete video card since removing the 2200g also likely meant removing all graphics the machine has stock. I put the gpu (RX 550, PCIE powered) in first while the old cpu was still in to make sure I could get working video from it, and it worked like a charm. I am using the hdmi port on the RX 550 and everything booted into windows 10 fine. No issues there so I moved on to installing the 2600 cpu, but now I get no image, the fans spin for a while and then turn off and restart. I tried resetting the cmos and that changed nothing. Shouldn’t there at least be a bios screen or something? What did I miss?

[NonSequitur777]

@LiquidSnek,

Welcome to our HP Community forum!

Your HP Pavilion 590-p0076 is fitted with the Sunflower motherboard (SSID: 8433) -specifications here: https://support.hp.com/us-en/document/c05939208.

The HP Pavilion 590-p0076 (Sunflower motherboard, SSID: 8433) cannot be upgraded with any officially Windows 11-eligible processor.  However, there are some really good W11 bypass methods available, and I'll share one of them in a follow-up post.

Your board officially supports AMD Ryzen 2nd-generation CPUs (Pinnacle Ridge) such as the Ryzen 5 2600, Ryzen 5 2600X, and Ryzen 7 2700. As an FYI: the Ryzen 7 2700X is not compatible because its high TDP (105-watt) prevents it from being accepted.

Since you already updated the BIOS, your system should recognize these processors correctly. The fact that the fans start, then cycle off and on with no display output, usually points to one of the following issues:

1. CPU seating or pin contact issue –Double-check for bent pins or improper seating. Even slight misalignment can prevent POST.

2. Check for any debris (thermal paste, etc.) on either your processor or CPU slot.

3. Residual CMOS data – After a CPU swap, perform a full CMOS reset:

   • Unplug AC power.

   • Hold the power button for ~15 seconds.

   • Remove the CMOS battery for 10 minutes, then reinstall.

4. Memory retraining issue –Boot with only one stick of RAM installed and the RX 550 connected.

If it still fails to POST, reinstall the original Ryzen 3 2200G to confirm motherboard health. If the system boots normally again with the 2200G, then re-try the 2600, carefully rechecking CPU installation and power connections.

The Ryzen 5 2600, Ryzen 5 2600X and Ryzen 7 2700 are known to work perfectly on this platform.

Also, your upgraded CPU will provide TPM 2.0 support through the processor’s built-in firmware TPM (fTPM), which can be enabled in BIOS under Security > Trusted Platform Module > TPM Device > Firmware TPM.

Summary:

• Best compatible CPUs: Ryzen 5 2600 / 2600X / Ryzen 7 2700.

• Supports fTPM 2.0 (Windows 11-ready once enabled).

• If fans cycle with no POST: reseat CPU, clear CMOS, and test with minimal configuration.

Kind Regards,

NonSequitur777

[NonSequitur777]

@LiquidSnek,

If you like your PC, there are a number of reliable and effective bypass methods developed which would allow you to almost effortlessly upgrade your so-called "unsupported device" to Windows 11, such as this easy-to-follow YouTube instructional video shows: https://www.youtube.com/watch?v=lSrmhhigEhY&t=332s&ab_channel=Tips2Fix.

This method uses a clever Microsoft (Server) backdoor Windows 11 install method.

This works great: I have used it myself on a number of legacy HP desktops without any issues whatsoever.

I cannot emphasize enough that this particular W11 upgrade method is hard to beat in terms of simplicity!

The Tips2Fix approach basically modifies the Windows 11 install media by replacing just one file (appraiserres.dll) with the Windows 10 version, which instantly disables all TPM, CPU, and Secure Boot checks without extra prompts or tool-specific steps.

Unless Microsoft changes the installer logic in future builds, this file-swap method will likely remain the quickest workaround for unsupported hardware such as your HP Pavilion 590-p0076.

Anyway, in the off-chance you don't like W11, you have 10 days to roll back to Windows 10. After 10 days, unless you follow the steps outlined in this instructional video, you may need to do a fresh install of Windows 10. Either way, this video will show you what to do with easy-to-follow instructions: https://www.youtube.com/watch?v=2v9_-4JCh_U&ab_channel=Tips2Fix.

Kind Regards,

NonSequitur777

[LiquidSnek]

Thank you for the information I put the 2200g back in before I went out to do some chores earlier which is why I’m just now responding. Anyway the system boots fine with the original processor. I really would like to have a non hacky windows 11 installation on this but if all the drivers work the same, I guess it’ll be alright.

Still, I already sunk a bit into this plan to run with the 2600. I’ll try to reseat it again. Especially because the pins on it are perfect but I noticed some strange I/O errors with the motherboard some days ago when I tried to install an nvme drive on it. It took me 5 tries reseating the drive and cleaning the contacts for it to stop showing errors. Would it be crazy to scrub the cpu socket with alcohol? 

on the issue of official Win 11 compatibility, I was lead to believe the 2600 was supported based on this: https://learn.microsoft.com/en-us/windows-hardware/design/minimum/supported/windows-11-supported-amd...

The 2600 is listed there

[NonSequitur777]

@LiquidSnek,

Very good -my bad, I should have been clearer: yes, the page "Windows 11 supported AMD processors" does indeed list "AMD Ryzen 5 2600" amongst the supported W11 processors, but compatibility depends heavily on whether HP's BIOS for your specific OEM board actually enables or exposes those features (fTPM, TPM enable, Secure Boot, microcode treatment) in a full, compatible way.

From what I was able to ascertain, real-world HP Pavilion 590-p0xxx user reports have suggested some uncertainty -some users report "TPM unavailable" or "doesn't meet minimum requirements" even after upgrading their CPU, which may point to HP's BIOS either missing or disabling parts of the implementation.

For example, please consider these discussions: Solved: Upgrade to Windows 11 with Ryzen 2600 - HP Support Community - 8533029 and: Can’t update to Windows 11 — What should I upgrade? (Ryzen 5 2600, RX 590, 16GB RAM) : r/techsupport.

Try the Microsoft Compatibility Appraiser for Windows 11 installation: you need to manually run the task by opening Task Scheduler, navigating to Microsoft > Windows > Application Experience, right-clicking on Microsoft Compatibility Appraiser, and selecting Run. This forces the tool to update your PC's compatibility status, which can help resolve issues where the Windows Update or PC Health Check tool isn't reflecting correct compatibility information.

Summarizing, make sure that your boot settings are UEFI only, Secure boot enabled, and TPM enabled.

Kind Regards,

NonSequitur777

[LiquidSnek]

Well, unfortunately I think this little project has come to an end. I did try putting some alcohol in the socket and I let it dry out for a while, but that seems to have been enough to kill it cus now it won’t power up at all. Shame. I found this little thing in my mom’s garage. It was basically trash and I thought maybe I could salvage it. It seemed like low stakes and modest reward potential, but it’s not looking to pay off now

[NonSequitur777]

@LiquidSnek,

Sorry to hear that your upgrade project came to an ignominious end...  I mean, because there is some ambiguity going on with your AMD (Sunflower) system as I pointed out, I was hoping you would be able to upgrade it to Windows 11 after all.

Speaking of "scrub the cpu socket with alcohol", I should have mentioned, that yes, you can do that, but only with a very specific kind of alcohol -namely, electronic or so-called laboratory grade 99.9% Isopropyl Alcohol, such as this Amazon purchase option shows (hint: this is what I am using).

Thing is, you want to use a quality product with the least amount of water, because -spoiler alert: water and electronics don't do well together. So, you can use this product, using a small brush with soft bristles dipped ever so lightly with the isopropyl alcohol -and even with 99.9% purity, you should still wait ten minutes or so, before turning things on again. Anyway, I digress.

Maybe you should disconnect your PC from power, and wait at least a day or so, and try again.

Wishing you well,

NonSequitur777

[LiquidSnek]

Thanks again. Yeah I guess the drug store 97% bottle didn’t pass muster lol

[LiquidSnek]

Ok so I decided try to plug it in and power it on and it seems the board is back to life! 

The 2600 still won’t post though. I only have one ram stick and I tried moving over to the other slot, and that did nothing. Idk, this board just refuses to boot with this seemingly flawless looking chip. Nothing is cracked, there’s no pins out of place, it’s clean…

I bought some of that 99.9% alcohol. Should arrive through mail in a few days. If cleaning the cpu socket does nothing, then idk what else to really do 

[NonSequitur777]

@LiquidSnek,

All right! -Glad to hear the system came back to life!

Your HP Pavilion 590-p0076 (Sunflower motherboard) does support the Ryzen 5 2600, and your Radeon RX 550 draws power directly from the PCIe slot -so there's no compatibility issue there. Since it still won't POST with the 2600, the problem may be due to a marginal socket or firmware condition rather than hardware incompatibility.

Here's what I'd try next:

1. Confirm BIOS version — Boot with the Ryzen 3 2200G and make sure you’re running BIOS F.41 Rev.A (the latest available from HP). If not, update to that first.

2. Clear CMOS after swapping CPUs — With power disconnected, remove the CMOS battery for 10 minutes (or use the reset jumper). Then reinstall the 2600 and attempt to boot.

3. Clean the AM4 socket — Once your 99.9% isopropyl alcohol arrives, lightly brush the socket with a soft anti-static brush moistened with the alcohol. Even a thin oxide layer or residue could interrupt pin contact. Let it dry completely (at least 20 minutes) before powering up.

4. Try one RAM stick in slot A1 — After a CPU swap, the Sunflower board can be picky about DIMM slot population.

5. Check for power cycling — If fans spin briefly and then restart, that indicates a CPU initialization failure -most often caused by poor pin contact or unstable BIOS data.

If it still won't POST, testing the Ryzen 5 2600 in another known-good AM4 board (e.g., B450) will confirm whether the CPU itself is good before concluding the Sunflower board is at fault.

Kind Regards,

NonSequitur777