Need help troubleshooting an amplifier.

@mlsstl

The reason I didn’t include my make and model initially was because BMC is an unknown brand. I expected 0 people here to know about its specifics.

I only asked basic eletrical stuffs that would apply to most amplifiers, like DC voltage of the terminals and if the readings were normal, and if this could potentially be a power supply issue.

I'd love to send this amp off for repairs but it's 100 lbs and very uneconomical and would make sense only as a last resort.

I have no urge to "prove you wrong" but don't understand why you thought it was unimportant to provide a make/model until pressed.  Sometimes a particular make/model of just about anything (car, TV, computer, audio gear...) will have known issues that are specific to that item.  Giving the make/model of your unit will let other owners or those with experience give you helpful info.  That info would be irrelevant to most other brands on the market.

Personally, I have no experience with the BMC S1 so can't provide any further help, but hope someone else recognizes the issue and can assist. Otherwise, you'll probably need to send the unit off for service.

@mlsstl I've provided the make and model. By all means prove me wrong.

Interesting -- you say you are a novice who knows nothing about electrical stuff but then state you are "certain" that the make & model mean nothing for determining the problem. 

Beyond checking for blown fuses and making sure the unit is properly plugged in and connected correctly to the source and speakers, anything beyond that will likely need an experience technician to fix.

I didn't include make and model because I'm certain it won't change the end result.

The make and model is BMC S1

@samureyex If you don’t provide make/model of amp, no one is going to be able to assist.

Based on all the description I can give, that the positive terminal has no voltage. Could it mean a blown fuse on the power supply?

@carlsbad2 Normally it turns on and countdown from 10 to 0. But in this situation it counts to 5 and then get a permanent error.

Stage 5?

Tell us what amp you have. Don’t be shy! Since the builder/designer is still alive and kicking he would be the obvious first choice to go to! Send him the amp and tell him to fix it! You don’t know enough about electronics to work on it.