0

My machine is a HP ProDesk 400 G4 SFF running Ubuntu Server 20.04.

It was running just fine with the original Intel i5-6500 CPU, but upon upgrading to an i7-6700 the system will no longer boot.

I've tried entering rescue mode and emergency mode, but neither of them will actually boot the system. Any ideas?

EDIT: I'm unable to boot from install media on a USB drive either. Here is a screenshot of a failed boot:

segmentation fault

Improve this question

1 Answer 1

Reset to default
0

ramdisk

Your ramdisk file is not current for your new CPU.

From the GRUB menu, boot to Recovery Mode...

  • GRUB menu

    • Additional Options

      • Recovery Mode

        • Root Access

And type:

sudo update-initramfs -c -k $(uname -r)

reboot

BIOS

HP ProDesk 400 G4 Small Form Factor PC

You currently have BIOS version P08 2.15, from Jan 30, 2018.

There's a newer BIOS available, version P08 02.35 Rev.A, from May 11, 2020, and can be downloaded here.

Note: Confirm that I have the correct web page for your model #.

Note: Have good backups before updating the BIOS.

memtest

Go to https://www.memtest86.com/ and download/run their free memtest to test your memory. Get at least one complete pass of all the 4/4 tests to confirm good memory. This may take many hours to complete.

Update #1:

memtest fails at test #6 [Block Move], with i7, and either 8G or 32G RAM installed. Same address range. Suspect CPU or motherboard problem.

Update #2:

It was determined that the (used) i7 CPU was defective. The i5 CPU was reinstalled, and memtest ran fine again.

Improve this answer
18
  • I've actually tried to get into recovery mode from grub with new CPU fitted - no dice :( The screenshot that I included was from an attempt to boot from the Server 20.04 install media, so surely my ramdisk shouldn't prevent the installer from starting? I'll try updating the BIOS and report back. Memtest was successfully run a few months ago when the RAM was fitted.
    – Dalarielus
    Commented Sep 10, 2020 at 22:13
  • @Dalarielus Can you not boot to a Ubuntu Live DVD/USB? If not, on another system, do part 3 of my answer... and build a memtest flash, and check your RAM on this system.
    – heynnema
    Commented Sep 10, 2020 at 22:17
  • @Dalarielus Is your CPU or RAM overclocked?
    – heynnema
    Commented Sep 10, 2020 at 22:21
  • I've tried booting from the Ubuntu Server 20.04 install media from a USB flash disk (the same disk that I used to originally install Ubuntu onto this system) and it fails with segmentation faults and a kernel panic. Memtest is currently running with the RAM transplanted into another system, but I'm not expecting any faults since it was known to be good a couple of months ago and the system booted normally after swapping the old CPU back into it. The CPU and RAM are both running at stock speeds and haven't been overclocked.
    – Dalarielus
    Commented Sep 10, 2020 at 22:31
  • @Dalarielus Oh, you really need to run memtest with the RAM in the original machine with i7, assuming that the memtest flash will boot there.
    – heynnema
    Commented Sep 10, 2020 at 22:32

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .