Cant boot MX23 on P520, reboot loop

[razor2021]

I'm a BIOS guy, and I always look at making sure my machine is running the latest BIOS before doing any operating system. If you look below at the descriptions, there is something in one of the BIOS regarding reboot issue, and there are also a number of power and memory support fixes among many others. IMO, maybe upgrade your older BIOS first to get all these power and memory fixes just to rule out any driver instability when using with MX23. Just my 2 cents.

Your machine is running --> S03KT40A
The latest available for your machine is --> S03KT61A

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S03KT61A
-Update DBX key to May 9, 2023
-Update IFX TPM2.0 FW
-Update UEFI diag to 04.29.000
-Update RC to support IPU 2023.1 and 2022.3

S03KT60A
-Force BRCM5719 lan speed to Gen2 in auto setting.
-Update J3/J9/JY BIOS flash tool.

S03KT59A
-Enhancement to address security vulnerability CVE-2022-34301,CVE-2022-34302,CVE-2022-34303,CVE-2022-40250,CVE-2021-30004,LEN-77635,LEN-96364,LEN-96365,LEN-96366,LEN-96367.
-Dynamic disable Nvidia GFX card HEVC.

S03KT58A
-Enhancement to address security vulnerability LEN-96373.
-Change JY update method from runtime flash to capsule update.
-Update MF package to support keep default setting.

S03KT57A
-Enhancement to address security vulnerability LEN-95703, LEN-95703, SA50122.
-Enhancement DHCP pxe boot stability.
-Update UEFI diag to 04.26.000
-Update Microcode & ME to support 2022.1IPU.
-Optimize smi password retry policy.

S03KT56A
-Enhancement to address security vulnerability LEN-78119,LEN-84945,LEN-84946,LEN-84951.
-Update RC & Microcode & ACM to support 2022.1IPU.
-Add wFlashGUI tool to support GUI for JY package.

S03KT55A
-Add support new Raid card LS-9560-16i in Fan table.
-Enhancement to address security vulnerability CVE-2021-28216, LEN-77465, LEN-79454, LEN-84093.
-Enhancement to address security vulnerability LEN-84071, LEN-84947, LEN-84952, LEN-84948, LEN-84949, LEN-84954, LEN-84950

S03KT54A
-Update Bitland lan card UEFI ROM to 2.057.2021.11.22.
-Enhancement to address security vulnerability  LEN-78118.
-Improve CPU performance when COM1 cable inserted.

S03KT53A
-Fix RC update caused BSOD in some extreme condition.
-Update UEFI diag to 04.20.000
-Fix Smart usb protection abnormal once permanently disable computrace.

S03KT52A
-Enhanced SMBIOS Type3 SerialNumber value.
-Add more help message for "Security Erase HDD Data" item.
-Enhancement to address security vulnerability LEN-75197.
-Update MCU & CSME to support 2021IPU2.
-Enhanced permanent disable computrace function.
-Enable WPBT module for A and P version.

S03KT51A
-Update Fan table 4 to support 64G 3200 Memory.
-Don't install WPBT table if USB smart protection disabled.

S03KT50A
-Remove Static Virtual Lockstep Mode support based on Intel removed it.
-Enhance http boot function to support multiple http boot option.

S03KT49A
-Update UEFI diag to 04.19.000.
-Upgrade RC to Support IPU 2021.1.
-Update RSTe driver to 7.5.11.1002, and remove legacy RSTe support.
-Update CSME to 11.12.86.1877.
-Enhancement to address security vulnerability CVE-2021-0144.

S03KT48A
-Change customer wmi setup item name.
-Add Customer Efivar.
-Update P520-P720 PSU Overload Spec v1_4 setting
-Rollback FWTS SMBIOS Type3 issue. Remove Type39 information.
-Fix when PAP/POP keyin wrong cause display error button.

S03KT47A
-Enhancement to address security vulnerability CVE-2020-10255.
-Enhancement to address security vulnerability LEN-50824.
-Enhance PSU overload log.
-Fix FWTS issue. DBGP, GammingGUID remove, Type3/Type39, PC00.XHCI.RHUB.SSxx._PLD returned value.
-Enhance PAP security.

S03KT46A
-Enhancement to address security vulnerability CVE-2020-10713.
-Enhancement to address security vulnerability LEN-43114.
-Enhance the BIOS setup function for SAS card.
-Update PSU overload feature.

S03KT45A
-Rollback ME to 11.12.77.1664.
-Fix BIOS settings captured by SR tool on older BIOS did not work on BIOS 43A/44A.
-Enhance the SMBIOS type 17.
-Enhance the PAP verification feature.

S03KT44A
-Enhance PCIe stability.

S03KT43A
-Update RC code to 1524.D00.
-Support Win10 20H2. 
-Update ME to 11.12.80.1734
-Enhance SMBIOS type 11.

S03KT42A
-Enhancement to address security vulnerability CVE-2020-8696, CVE-2020-8698.
-Enhance the BIOS setup information.
-Fix that Intel M.2 SSD is not deteced by BIOS with SATA RAID mode.
-Fix the potential reboot issue with software Houdini for 165W CPU.
-Support new graphics card.

S03KT41A
-Enhance the RTC date and time.
-Enhance the BIOS update process.
-Update fan table for a specific configuration.
-Change BIOS setup mode to text with SOL.

S03KT40A
-Enhance HDD passoword function
-Enhance Configuration Change Detection
-Enable PCIe Port Bifurcation for P520c x16 slot

[Lobstercat]

Thank you very much for all your help! Sadly that is also a no-go, as nothing is plugged in to that USB port.

[Lobstercat]

Okay an update: MX still won't boot. I admit I never thought about the BIOS, I just assumed it would be updated already & wouldn't think of checking that for another year. I updated the BIOS though, thank you for that idea. Also re-rendered my iso with the Liquor kernel. Sadly it still doesn't boot. Same behavior whether using physical DVD, USB, Easy2Boot, or adding to GRUB boot menu. Only one piece of text flashes, and that's the probing EDD line which says it's okay. So, whatever comes right after that... Screen flashes a few times and reboots. The lengthy GRUB/Bootloader updating in Fedora & LinuxLite & SuperGrub2 Disk IS due to the M.2 drive, not sure what to do about that, or if there is anything that can be done. But now I don't think the MX booting problem is pertaining to that, although it could play a role. Strange. Any more ideas?

[theLegionWithin]

perhaps I missed it, but have you tried to reset the bios to factory default, then to whatever values needed (ie: UEFI with CSM, etc)?

if that fails, can you pull the m.2 and put it in a different machine - if so, does it pass in a SMART/health check?

[Charlie Brown]

You can also try

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edd=skip[mbr]