I have a Boss DD-5 that I bought off eBay last year. It's been working fine until yesterday when I tried using it. I had it plugged into the official Boss power supply and had it running through my FX loop, with everything connected properly.

The first thing I noticed was that the LED was on, even though I wasn't getting any delay. So I stepped on the pedal and it just gave a loud, deep popping noise and didn't come on. I kept trying to step on it and it still wouldn't come on, and the popping noise kept occuring, even if I knocked or moved the pedal at all.

I know the power supply works, because I used it with another pedal and it worked just fine so that can't be the problem.

Here's what I've tried so far:
Putting pedal in FX Loop
Putting pedal in front of amp
Using a battery instead of wall power
Using wall power
Using different amp
Using different cables

Can someone tell me whats going on? Thanks!
Ibanez RGT42DX
Vox AC30C2
Digitech Whammy (FOR SALE!)
Dunlop GCB-95F Crybaby
Boss DD-20
Boss SD-1
Ibanez TS9DX
MXR M-108 10 Band EQ