Random death? Or not?

Sep 16, 2018
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Hi. So today I powered on my HP Compaq 6005 Pro SFF, but it wasn't booting. It did 9 beeps (idk what that means). I decided to take out the SSD, RAM and the CMOS. I didn't want to mess with the proprietary PSU and CPU. Then, I unplugged all cables from the PC except for the power and display ones. Then I turned on the PC: LEDs on, no beeps (should beep for RAM missing atleast), no display, fans running. I force turned it off, put the components back, the same thing. What did I do?
Specs: the default HP Compaq 6005 Pro SFF ones, changed only HDD>SSD and added more RAM (2>9). Thanks!