The computer case has abnormal noise and is turned off, so it can't be turned on again. Who knows what the situation is?

I think the power supply is burnt out. In the whole computer case, only the power box has a high-voltage circuit, and other parts are low-voltage DC, with limited current. Basically, a short circuit won't make such a loud noise. What you said should be that the primary side of the power supply is short-circuited, and the noise of the power supply I repaired is basically broken. Common causes of power explosion are: 1. Abnormal power supply voltage; 2. There is too much dust or foreign matter inside the power supply; 3. The quality is not good; 4. The power circuit board crashed into the shell (this happened once, but this time I was deeply impressed. I fixed it, put it on the shell, electrified it and exploded it. If you have certain maintenance skills, you can continue to ask, and I can tell you how to repair it. If you are not sure whether it can be repaired, you can find someone to repair it or change the power supply.

Explosicum of electrolytic capacitor is not impossible, but I have never met it. All the electrolytic capacitor failures I encountered were bulging of the safety cover, which had not completely exploded. But this reason cannot be ruled out. The retail price of an electrolytic capacitor is about 1 yuan, so don't be slaughtered when repairing it.