2 short 1 long beep

[ZephTNTGamer]

Hello.

So I will try to go through this quickly basically I got a CPU a few months ago it was a working CPU I checked the compatibility with my motherboard and all of that then I put it in the socket and tried to turn on my PC I got 1 short 2 long or 2 long 1 shot not sure it was like the start of 2021 so I'm asking can it be to the bios version because when I put the old CPU in it works my bios is like 11 years old I think the new version is like 6.11 or 6.10 I'm on 6.05 so yea that just went over my mind and I wanted to ask

I do not know what CPU it was it was either a quad-core q8400 q9300 or q9400 

If you want to know I have a Foxconn 2A8C socket: 775 lga chipset: g41 

[Prométhée]

Hello
sorry, it's not very clear to me
however, if this is your model:

HP 500B Microtower Business PC Product Specifications

list of compatible processors

Intel Celeron Dual-Core Processors Intel Celeron E3300 Processor (2.5 GHz, 1MB L2 cache, 800 MHz FSB) Intel Celeron E3400 Processor (2.6 GHz, 1MB L2 cache, 800 MHz FSB) Intel Pentium Dual-Core Processors Intel Pentium E5500 Processor (2.80 GHz, 2MB L2 cache, 800 MHz FSB) Intel Pentium E5700 Processor (3.00 GHz, 2MB L2 cache, 800 MHz FSB) Intel Pentium E6600 Processor (3.06 GHz, 2MB L2 cache, 1066 MHz FSB) Intel Pentium E6700 Processor (3.20 GHz, 2MB L2 cache, 1066 MHz FSB) Intel Pentium E6800 Processor (3.33 GHz, 2MB L2 cache, 1066 MHz FSB Intel Core 2 Duo Processors Intel Core 2 Duo E7500 Processor (2.93 GHz, 3MB L2 cache, 1066 MHz FSB) Intel Core 2 Duo E7600 Processor (3.06 GHz, 3MB L2 cache, 1066 MHz FSB) Intel Core 2 Duo E8400 Processor (3.0 GHz, 6MB L2 cache, 1333-MHz FSB) Intel Core 2 Duo E8500 Processor (3.16 GHz, 6MB L2 cache, 1333-MHz FSB) Intel Core 2 Duo E8600 Processor (3.33 GHz, 6MB L2 cache, 1333-MHz FSB)

also check

 Illustrated Parts & Service Map: HP 500B MT Business PC

[ZephTNTGamer]

Can you send me a compatible list of cpu's for Foxconn 2a8c the socket is lga775 I'm extremely confused because someone says that it does support quad cores someone says it doesn't 

thanks in advance

[Prométhée]

sorry have you read and understood my previous answer
if it's your computer, you have everything you need here