-
×InformationNeed Windows 11 help?Check documents on compatibility, FAQs, upgrade information and available fixes.
Windows 11 Support Center. -
-
×InformationNeed Windows 11 help?Check documents on compatibility, FAQs, upgrade information and available fixes.
Windows 11 Support Center. -
- HP Community
- Desktops
- Business PCs, Workstations and Point of Sale Systems
- HP 400 G3 do not post but power is on

Create an account on the HP Community to personalize your profile and ask a question
10-07-2020 07:20 PM
I wrote this same question to spiceworks.com but the problem is not solved and I wonder if HP forum could help me out with this problem.
So, I have this old war horse HP Prodesk 400 G3 SFF. It has worked fine for years but on friday it did not post. Warranty ended 2018 and therefore I need to ask this here. When I press power button the led light up but nothing more happens. No monitor signal (tested with several monitors). I have done all the tricks and nothing helps.
Please read the rest from the link above.
Anyone have any idea how to resurrect this nice piece of hardware?
10-08-2020 12:01 AM - edited 10-08-2020 12:02 AM
the most likely items that can cause this are
power supply
defective motherboard
both items can be found used on ebay, but i question if it's worthwhile to do so
it may be a better choice to simply replace the system with another G3 or perhaps the slightly newer G4
10-08-2020 04:21 AM
PSU should be fine. I've tested this setup with another good PSU and with it this hw do exactly the same.
I suspect that there is something fishy with the MB but I cannot figure out what.
As stated in the spicework thread in my mind it is strange that this is kinda semi-alive. Never seen symptoms like this. If this would be totally dead I would just throw this to metal recycling trash pallet. What is strange the it seems to me that some bios checkups are run (because of beeps/blinks if memory is removed or processor has no power) but it do not post.
This is zero money worth old computer and I have other newer computers and I could just throw this one to trash but I am curious to find out what is wrong with this because of the symptoms. Power is on and pre-post checkups are run but not completed. BIOS messed up or real hw failure?
I am not going to invest into this a dime but only some time if could revive this. Just for interest. Anyone any ideas to try?