Upgraded PC but won’t boot

[owenegan19]

Just upgraded my CPU to a Ryzen 5900x from a 3600. Updated BIOS for my B450 Tomahawk Max to the latest before changing but it will not boot with the new CPU installed.

Any ideas as to why?

 

[Tetras]

Can you describe more detail about what "not boot" means please, e.g. black screen with all fans running? BIOS displays but windows doesn't load?

Did you change the cooler, memory or anything else?

 

[owenegan19]

Can you describe more detail about what "not boot" means please, e.g. black screen with all fans running? BIOS displays but windows doesn't load?

Did you change the cooler, memory or anything else?

PC powers on, fans running and RGB parts on. But no display shows up, not black screen like it’s outputting something but a no signal message on my monitor.

Changed the cooler from the stock cooler to another

 

[Tetras]

Does your computer have anything on it? E.g. do you have a Windows 11 install with secure boot and TPM enabled?

If you don't have any reason to fear for your Windows install, I would try clearing the CMOS as a first step.

Changed the cooler from the stock cooler to another

Does it have a different mounting mechanism?

 

[owenegan19]

Does your computer have anything on it? E.g. do you have a Windows 11 install with secure boot and TPM enabled?

If you don't have any reason to fear for your Windows install, I would try clearing the CMOS as a first step.


Does it have a different mounting mechanism?

Yeah it has Windows 11 and I believe those are enabled, have all my data on it too I don’t know if that’s any issue

Yeah the new cooler has extra mounting mechanism that rise it up a bit

 

[Tetras]

Yeah it has Windows 11 and I believe those are enabled, have all my data on it too I don’t know if that’s any issue

In that case, I'd strongly recommend that you do not clear the CMOS, since it might clear your TPM keys and make the system unbootable with your old CPU and your data not recoverable. If your keys are saved on your Microsoft account or backed up then you might get around that.

Can you take a picture of the assembled PC? One of the most common reasons this happens is that somebody forgot to plug in the 8-pin at the top of the board for the CPU.

Yeah the new cooler has extra mounting mechanism that rise it up a bit

The cooler mount can sometimes cause boot problems if it is too tight, too loose, or uneven.

 

[Rob_B]

You put the video cable back in the right port yeah?

Try your old CPU back in it again, does it boot ok?

 

[something daft already!!]

In that case, I'd strongly recommend that you do not clear the CMOS, since it might clear your TPM keys and make the system unbootable with your old CPU and your data not recoverable. If your keys are saved on your Microsoft account or backed up then you might get around that.

Can you take a picture of the assembled PC? One of the most common reasons this happens is that somebody forgot to plug in the 8-pin at the top of the board for the CPU.


The cooler mount can sometimes cause boot problems if it is too tight, too loose, or uneven.

It's so annoying when a new part you bought does not work as expected.

Clearing CMOS should not effect the TPM. I've done it many times on my Mobo with no ill effects. The cooler loose or even removed, should still allow a boot. It would just overheat quickly, with a thermal shutdown.

I suspect clearing CMOS would help but it depends on the issue. JBAT1 clears CMOS, power down and short the pins with a screwdriver or jumper for a count of ten, and then remove the jumper/screwdriver and power up.

Have you plugged the HDMI or Display port into the GPU and not an onboard graphics slot?

The BIOS will need to detect the new CPU, mine was fine detecting but I had to setup TPM again and got a message about this.

Does the BIOS you installed support the CPU, latest BIOS release says yes.

Have you tried reseating the CPU?

Is everything else secure in the Mobo such as RAM, GPU, cables, etc? It's easy to miss a cable, as above, the 12v CPU power one.

Whatever you try, take your time and don't rush it.

 

[hornetstinger]

In that case, I'd strongly recommend that you do not clear the CMOS, since it might clear your TPM keys and make the system unbootable with your old CPU and your data not recoverable. If your keys are saved on your Microsoft account or backed up then you might get around that.

Can you take a picture of the assembled PC? One of the most common reasons this happens is that somebody forgot to plug in the 8-pin at the top of the board for the CPU.


The cooler mount can sometimes cause boot problems if it is too tight, too loose, or uneven.

Wow another stupid thing with new motherboards, tpm and keys.

Brilliant .

 

[Tetras]

Clearing CMOS should not effect the TPM. I've done it many times on my Mobo with no ill effects. The cooler loose or even removed, should still allow a boot. It would just overheat quickly, with a thermal shutdown.

I think the keys are stored in the ME on Intel systems when using a firmware TPM through PTT, so in theory they should be safe, but when you clear the CMOS it can change the default setting of the TPM (e.g. from enable to disable) or reconfigure the keys. If you don't have Windows Hello or Bitlocker enabled it's usually not a problem if the TPM is reset.

 

[ltron]

Does that board have a Qcode Post error reader? If so what code is it showing?