I've actually got a Cyber Lead myself
what you have yourself there is something exceedingly rare. And the Cyber Lead cabs aren't common to begin with.
That's a Cyber Lead 2 with the memory card readers on the front. It's also in rather good condition with very little yellowing of the plastic (better than mine)
That looks like a CPS1 boardset, probably SF2 CE, even better!
The fact you got that for almost nothing is staggering, nice pickup!
Anyway - some information I can give you straight away:
The cyber lead comes standard as a JVS cabinet, yours has been rewired to JAMMA, that's a common modification and makes life easier anyway unless you really want to play Namco System 11/12 games that can use the funky marquee on top and make it do different things, or a NAOMI system without having to use the Capcom or Sega adapter
That is the original Namco power supply, it's a good power supply and will even power a NAOMI setup with a DIMM so nothing wrong there.
The monitor on that looks good too, if it's original it's a Nanao MS9-29 dual res monitor and it's damn good. It may need a refurbish but it's a very easy to refurb monitor and there's plenty of people who can do that. The same monitor is used on Daytona, Sega Rally, Astro City and other Sega cabs.
First steps:
Measure the power pins on the JAMMA connector to see if you're getting the correct amount of power to the board and that the power supply is functioning correctly.
Can you hear the coil noise from the monitor starting up? Can you hear any sounds from the game that's in it?
The volume control is behind the control panel, you can remove the control panel by unlocking it with the key on the bottom then use the joysticks to pull the control panel forward and out, then lift it up and you should see the volume control, original I/O board if it's there and the monitor adjustment settings.