Solved: Re: HP 255 G7 Notebook 301 error message on start up - HP Support Community

samperuso1 · ‎07-23-2026

Hi

My hp 255 G7 notebook is getting the 301 error message on start up, looking at other posts, i now know its best to replace the hard drive before it fails, can someone show me the correct hard drive i need to replace the old one with, Edit..Just checked it seems i have an SSD installed will replacing that fix the error message ?

Thank you

Pallipurath · ‎07-24-2026

Hi @samperuso1

Welcome to the HP Support Community.

Thank you for posting your query.

The HP 255 G7’s “301 error” means the system has detected a failing drive, the SSD. Replacing the SSD with a compatible model (M.2 SATA ) will fix the issue, but you should back up your data immediately before the drive fails completely.

Before Proceeding further I would request you to perform the below step and go through the link shared.

Run HP diagnostics on startup

Power on or restart your notebook.
As soon as the HP logo appears, press the Esc key repeatedly (about once per second).
A Startup Menu will appear.
Press F2 to open System Diagnostics.
In the menu, choose Component Tests → Storage.
Select : Extensive Test
Run the Test.

https://support.hp.com/us-en/document/ish_3894112-3198952-16 Follow the link for detailed steps.

https://kaas.hpcloud.hp.com/pdf-public/pdf_13033529_en-US-1.pdf Service Guide.

I hope this helps.

Take care and have an amazing day!

I'm an HP Employee.

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View solution in original post

Pallipurath · ‎07-24-2026

Hi @samperuso1

Welcome to the HP Support Community.

Thank you for posting your query.

The HP 255 G7’s “301 error” means the system has detected a failing drive, the SSD. Replacing the SSD with a compatible model (M.2 SATA ) will fix the issue, but you should back up your data immediately before the drive fails completely.

Before Proceeding further I would request you to perform the below step and go through the link shared.

Run HP diagnostics on startup

Power on or restart your notebook.
As soon as the HP logo appears, press the Esc key repeatedly (about once per second).
A Startup Menu will appear.
Press F2 to open System Diagnostics.
In the menu, choose Component Tests → Storage.
Select : Extensive Test
Run the Test.

https://support.hp.com/us-en/document/ish_3894112-3198952-16 Follow the link for detailed steps.

https://kaas.hpcloud.hp.com/pdf-public/pdf_13033529_en-US-1.pdf Service Guide.

I hope this helps.

Take care and have an amazing day!

I'm an HP Employee.

If this reply helped resolve your issue, please select the Accept as Solution as it helps others in the community quickly find the answer they’re looking for.

And if you found this reply helpful, clicking Yes below is a great way to let us know we’re providing the support you need, as it encourages us to keep improving and sharing helpful guidance.

samperuso1 · ‎07-25-2026

Thank you for your reply

I have tried all the possible fixes, nothing solves the problem, still getting the 301 error on start up.

My data is already backed up on to a flash drive just in case it goes suddenly. I will purchase the relevant SSD you

advised.

Many thanks for confirming this, much appreciated

HP 255 G7 Notebook 301 error message on start up

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