Indeed, I can now shut down my system over and over again, even leave it off for a few hours, and still turn it back on just fine. You know what that indicates? I'll tell you...
1. Issue with the board circuits that cause them to have a better connection when warm then when cold (explains the lengthy delay required before system will exhibit cold boot problems).
2. Issue with the board capacitors.
3. Issue with the battery in that there is a problem with the connection to the board resulting in the inability to boot after all of the capacitors have been completly discharged.
4. Faulty PSU (unlikely) or board circuitry (more likely) that causes an unrealistic power draw at cold boot on the power supply. This indeed seems like the most feasable to me as it would explain why high power and amperage single-rail PSUs tend to not exhibit cold boot problems where as all other PSUs (basically 85%+ of them in the market) will exhibit some problems.
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