I had a computer that could only be booted with a hair dryer. I did not disassemble any parts, so I never got to know which exact part was failing, but a good 5-10 minutes of pre-heating with the dryer allowed it to boot.
A few years ago, my neighbor's PC wouldn't boot. Unlike similar situations I'd had with my own hardware, the power-supply wasn't dead -- in fact, at the back, there was a green blinking light. I went online and found people suggesting that, in such a case, blowing a hair-dryer at the power-supply might fix things. I tried it and...sure enough, the PC then booted.
Cool (or hot, as the case may be). Can I ask how you stumbled upon this solution? It's not one I would immediately reach for, especially the 5 - 10 minutes bit.
More examples: https://www.google.com/search?q=power+supply+blinking+light+...