Question New Motherboard in old HP computer case

[freccia]

I have an old Workstation HP xw4400 which I would like to update.
Before buying the wrong nessesary parts, I'd like to know from somebody with potentially corresponding experience, if it is possible, to build in et al a newer ATX Motherboard, because housing and Mainboards are known to be very proprietary and specific in some (older) HP Computers.
Thanks a lot for any advice

 

[Dark Lord of Tech]

The power and board pinouts are proprietary.

 

[freccia]

The power and board pinouts are proprietary.

Thanks Dark Lord of Tech
… which means, it is not possible, to remove the old PS & Mainboard and mount new ones of another brand?
I remember, that the slot in the case of the HP xw4400 did not exactly fit to the back panel of another Mainboard I tried to install.

 

[Dark Lord of Tech]

Yes , and the front panel connections don't match.

 

[freccia]

Can you recommend a good computer housing …???