4 beeps and red light on start up.

[CornishMutual]

Hi. Getting 4 beeps plus red light on startup, no POST message on HP Prodesk 400 G1 SFF.  Documentation suggests this is a 'Thermal' issue. 

I have reset CMOS, checked RAM seating, renewed thermal paste, fan spins up fast when powers on then stops.

Any other ideas?

Thanks in advance!

[Paul_Tikkanen]

Hi:

See the service manual, chapter 9, page 200 for how to troubleshoot the 4 beep code...

http://h10032.www1.hp.com/ctg/Manual/c04293196

[CornishMutual]

Thanks for the link. Contrary to what the other link on HP says, that one says it's power supply overload.

However, I have just taken the PSU from a known working PC, and still getting the 4 beeps. Won't even POST. 😞

Any other ideas? Tried downloading the USB 4 in 1 tool, but as it won't POST it won't pick up the USB drive.

Thanks.

[Paul_Tikkanen]

You're very welcome.

Unfortunately, I don't.

The last troubleshooting step listed is to replace the motherboard.

[CornishMutual]

Do you happen to know if the thermal sensor is removable, or is there a wire going into it that can be unplugged? Is it integrated into the motherboard?

[Goyadas]

fonte de alimentação sobrecarregada

[rick-s]

Thank you for visiting our English HP Support Community. We are only able to reply to posts written in English. To ensure a quick response it would be advisable to post your question in English. The following links are here to assist you if you prefer to post in the following Language Community..
 

German: HP Gemeinschaft
Spanish: HP Comunidad
French: HP Communauté
Portuguese: HP Comunidade
Chinese: HP 社区
Korean: HP 커뮤니티

Thank you for your understanding

[hed190]

Hey,

Did you solved the problem? I have the same problem with a HP Elitedesk 800 G1 SFF, just have 2 more components to test, motherboard and cpu. I'll try to change the cpu with one that is working and the see if cpu is good.

But i'm inclined to faulty motherboard.

Regards,

[ITXpress]

Definitely following. Had a refurb that just finished it's torture test do the same. Reseated memory. Booted, then beeped again. Very weird because it almost seemed like it happened when we moved it!

[krso3]

hi I think the issue in the bios  

HP Desktop PCs - Computer Does Not Start and Emits an LED or Beep Code

https://support.hp.com/us-en/document/bph07107