Question Startup problems on HP SFF PC ?

[HDS445]

Hello all,

I have the following problem:

I recently bought a HP ProDesk 400 G5 SFF PC with an i5-8500 and installed a couple of RAM sticks but it does not start. When i press the power switch there is a white light for the HDD and it is illuminated while the button is on, then turns off and the PC does not start at all. No fans are spinning. Power button light does not illuminate at all. I assume the PSU is ok since there is a green light on the motherboard indicating there is power to the motherboard.

Things i have tried:

• Removing all parts (ssd,ram etc.) with no result.
• Removing the cpu which gave me cpu error (beeping + flashing lights). No results after resintalling.
• Removing the cmos battery (no result)
• Pressing the cmos button on motherboard (no result)
• Shorting the pins from the power button (they are integrated to the motherboard, there is no connector) - No result, still just hdd light illuminated but nothing starts or spins.
• Unplugging/Replugging all the power connectors (no result)

Can you give me any ideas as to what i can do or try other than what I have already tried ?
It seems like the power button has some issues but I ran out of ideas of what else to try...
Please help.

 

[Lutfij]

Welcome to the forums, newcomer!

I recently bought a HP ProDesk 400 G5 SFF PC with an i5-8500

Try and revert back to what the prebuilt came with, i.e, minus all the upgrades you'd performed. Adding a link or images to the rams you were trying to populate the slots with would help us two fold. Speaking of upgrades, how did you receive the prebuilt and what sort of upgrades did you perform besides the additional ram?

Prior top buying the used prebuilt, did you verify that it was in working condition?

Moved thread from Systems section to Prebuilt & Enterprise section

 

[HDS445]

Welcome to the forums, newcomer!

I recently bought a hp prodesk 400 g5 SFF with i5 8500
Try and revert back to what the prebuilt came with, i.e, minus all the upgrades you'd performed. Adding a link or images to the rams you were trying to populate the slots with would help us two fold. Speaking of upgrades, how did you receive the prebuilt and what sort of upgrades did you perform besides the additional ram?

Prior top buying the used prebuilt, did you verify that it was in working condition?

Moved thread from Systems section to Prebuilt & Enterprise section

Hello,

No, I bought it as a non working unit without any ram sticks. Ram is 2666mhz ddr4 2x8gb but does not work with or without it so the problem should be the button itself or the motherboard.

 

[LLegoLLaS]

Having the same issue. I replaced the montherboard and the ''new'' one died after 6 months. I believe it has something to do with a transistor near the thermal pad on the back of the motherboard as i could see some black trace but i am still trying to find a schematic

 

[Phillip Corcoran]

Having the same issue.

It is customary to start your own thread even if your having same or similar issue, so please do so.