Two Taito Type X's having bootloop issue

[OMG KON!]

Hello everyone, I've been a lurker on here for a while and this is my first time posting. I recently got in two Taito Type X systems and immediately started testing each unit I got in to see what the issues were (they were sold to me untested). Both units have the exact same problem and I am just not familiar enough with Taito Type X to say I am heading in the right direction. Essentially the system just constantly bootloops. You plug in power and the fans spin up for about half a second and then everything shuts off. After a 1-2 seconds, the system does the same thing and just constantly attempts to power up over and over but it is never successful.


Like I said, both units are doing the same thing. I'll note stuff I have tried so far below.
-Replaced Power Supply
-Removed GPU and tried to power up
-Removed RAM and tried to power up (to see if I would get error beeps... I didn't).
-Replace CMOS battery
-Reset CMOS battery
-Jumped the ATX power supply to startup by bridging GND to the Green Wire on the ATX connector (Everything powers up but nothing on screen)
-Removed the JVS card and wiring and attempted to power on by shorting front panel pins (system truns on for 0.5 seconds and does not bootloop)
-Adjusted the DIP switches on the JVS card
-Inspected motherboard for blown capacitors or board damage
-Reseated all connections and ensured 4-pin CPU molex was present

I've never gotten anything to show on screen and it's quite puzzling that the other one I have has the same problem. Does anyone know what might be the issue? I'm starting to suspect CPU but before I go out buying random parts to throw at one of them, I was hoping someone might have already ran into a similar issue before.

thanks!

 

[DoktorSleepless]

I recall seeing a thread on a similar issue, and one managed to revive his by pulling the entire motherboard out and screwing it back down. No idea why it worked, but he claims it did. I'm not saying it'll work for you, but it's worth a go before throwing parts at it.

 

[OMG KON!]

I already removed the motherboard to replace the battery. I did not try to power on the motherboard outside of the case. I suppose there could be a short or something when it's in the case but I think the odds are pretty slim.