There's 3 long beeps followed by 2 short beeps at switch on HP ProDesk 400G2 DM

[stratoM]

The pc stopped working.  I replaced the 240 GB ssd with a new 512 GB ssd. Then the beeps started. 3 Long beeps followed by 2 short ones. I removed the 2 sodimms.  Replaced one by one at alternate slots.  Same beeps. Inserted new sodimms:  now 2 long beeps followed by 2 shorts.  Same problem with disconnecting the ssd or keyboard or monitor.  Each time after waiting for the mandatory 30 seconds or more after powering off and removing the power plug.

I've selected Other at the Operating System, since the ssd had completely lost its Windows, ie its partition.

[DGroves]

bios related issue,..

HP 2 long beeps followed by 2 short is a bios recovery successful code 

3 short beeps and 1 long beep, CPU configuration error or CPU type is not compatible

[stratoM]

Thanks.

The beeps are 3 shorts and 2 long, not 3 S 1L.  Anyway the cpu was not changed.  I had removed some accumulated dust on the fan and around.  This action was after the beep issue.

[Prométhée]

hello
it depends on the document used

@DGroves  use this i think

•  BIOS Beep Codes

you have this also:

HP EliteDesk 800 G2 Desktop Mini, HP EliteDesk 705 G2 Desktop Mini, HP ProDesk 600 G2 Desktop Mini, ...

Hardware 3.2 The embedded controller has timed out waiting for BIOS to return from memory initialization

BIOS 2.2 The main area (DXE) of BIOS has become corrupted and there is no recovery binary image available.

[stratoM]

The PC is no longer with me.  I need to get it back one day, thanks.  Are you French?  Merci, a une autre fois!

[Prométhée]

Yes

 I had not seen Mauritius I don't know but must be a paradise

[stratoM]

Vous etes la bienvenue Promethee!! 

Lockdown due to Covid has been eased since 1 May, but our frontier and airport are still closed.

Inhabitants are free to travel or drive anywhere on the island except in some red zones where there are new infection flare ups.

Distanciation and masks of course de rigueur.