Hardware

Hellos my dell optiplex 755 only makes an orange blinking light when I turn it on.it does nothing at all like no sound no beeps no boot no display and fans don't spin as well. It's like my pc is dead .also the motherbored has yellow light when I plug the power cable into it .iv tried holding the power button for 20 secs when it's off then turning it back on but that doesn't work. Also . I think it could be the motherbored or th power supply that's the problem but I don't know for sure.also under the computer it was leaked with something that looked like water it was also on the outside of the pc and around it too.anyone know what's happening to my computer at all?