Hey, I really need some help. I have an optiplex 330 (I know it’s an old desktop but it performed just fine)
and I wanted to add an ssd to the computer. So I opened the case and installed the sdd. When I finished the installation, I plugged back all the cables, but when pressed the power button the computer would not start (even the button/switch didn’t change color as it usually does. Anyway, from the back side of the pc an orange light was visible on the motherboard. I tried and used different plugs for the cable but nothing didn’t work. Is it a power supply, a motherboard problem or something else ? I really need help.
(Also the computer was plugged on a ups)

Any advice would be appreciated