With everything plugged in I get nothing, no red light, no beep. I searched and found a video of a guy replacing the PSU fuse, but his model DC is different and I do not see anything similar on mine.
If you have a multimeter, trace back from where the mains plug is and very close to it should be a fuse. In fact, it should be the first component, if it’s blown, replace it with one of similar amperage.
Other than that, get a another PSU or DC. Both of them should be pretty cheap to buy nowadays.