Question HP Prodesk not Booting to BIOS

[GoldenCrepe]

I recently bought a secondhand "barebones" HP Prodesk 600 G3 Mini to build a simple linux desktop with, and it refuses to boot to BIOS.
The fans are running, the CPU is hot, but it has no display output in either Displayport.

PC details:

• Intel i5-7500
• 16 GB (2x8GB) DDR4 RAM
• 128 GB M.2 SSD
• PC does not have a CMOS battery

I assume that the CPU is supported because of this page, which lists the CPU. (Could it be because I have an Intel i5-7500 and not the Intel i5-7500T?)
I have attempted booting with only the CPU and one stick of RAM (in either slot) to no avail.
When forcing the PC off (holding power button for 5 seconds), it gives an error code of three long beeps, and four short beeps, which is the error for a system power failure.

The Displayport cable works with other computers.
Again, I will mention, there is no CMOS battery. I don't know if that's important or not.
Any help is greatly appreciated!

 

[Lutfij]

The i5-7500T is a 35W TDPO part, while the one you have is a 65W TDP part. I'm leaning on the BIOS having a blacklist/safeguard to no POST when seeing a processor beyond it's supported list.

Inspect the CPOU's socket and see if you have any bent or broken pins.

 

[GoldenCrepe]

The i5-7500T is a 35W TDPO part, while the one you have is a 65W TDP part. I'm leaning on the BIOS having a blacklist/safeguard to no POST when seeing a processor beyond it's supported list.

Inspect the CPOU's socket and see if you have any bent or broken pins.

Thank you for your response.
I have checked the CPU socket, and, as far as I can tell, there are not broken or bent pins.

Before I go and buy an Intel i5-7500T, is there any other things I should be aware of or test?

 

[COLGeek]

A missing battery should not prevent the system from booting. It will prevent you from saving BIOS settings, including system date/time when powering off.

 

[GoldenCrepe]

The i5-7500T is a 35W TDPO part, while the one you have is a 65W TDP part. I'm leaning on the BIOS having a blacklist/safeguard to no POST when seeing a processor beyond it's supported list.

Inspect the CPOU's socket and see if you have any bent or broken pins.

Yes, the incorrect CPU seemed to be the issue. Thank you for your assistance