SWF powers up, but sometimes not CPU

4 head SWF with dual touch screen.
Model: SWF / HC -UH1504D-45

Randomly, the system will not "beep" the cpu, but everything else powers-up.

Any idea why this might be happening?

I'm assuming a secondary power supply or lose wire, but I don't know where to look specifically.

Thanks in advance for any assistance.

Location: 
United States

Although nobody responded, maybe this post will help someone else with a similar issue. I solved my own problem: SPLIT screen 4 head 15 needle 2005 SWF

Electrical issue was a failing power supply.

I was able to order one through StitchIt international out of MO. They were very helpful and very knowledgeable. If you own a SWF, this company's phone number should be in your contacts.