Laptop will not boot despite LED indicating power.

I checked all sorts of problems and see that my motherboard indicates power, but no boot-up. First problem was to clear the cache (drain residual power). That didn’t do the trick. Next was to check my battery. But battery LED indicated that it’s fine. I also checked my connections. And I even changed the CMOS battery. I even did a full-on breadboard test and saw no indication of life in the laptop. The last thing I want is to find out that the motherboard has a blown capacitor or a short somewhere that would indicate a replacement or repair is necessary. Unfortunately, there’s no power button that I am aware of on the motherboard to do a strict version of breadboarding. Any other options? Or do I give up and get a new motherboard?