Fans try to spin up briefly and repeatedly, no other signs of life
Trying to work on a Series S that I got off Facebook Marketplace. I’ve taken off all the casing, and have noticed that when I plug the power cable in, the fan spins up briefly and repeatedly (I can hear the fan whirring for a moment every two seconds or so, alongside the spinning). There’s no other signs of life, power button doesn’t do anything and no video output.
I’ve checked the power supply with a multimeter, and it’s outputting 12V, which matches up with the label on the power supply, but what’s the odds that the power supply is faulty anyway? If not the power supply, any suggestions for what else I should try? Thanks.