When I switch on my YSP-1 I get a loud crackling and popping sound. For a while I could repeatedly turn the unit on and off until the noise stopped and the real sound started, but now it's just noise. Any ideas on what the problem is? From a quick search, I see a number of people have the same problem.

SOURCE: I get a loud static noise, when I first turn on

u have a cool sound projector but u have a baaaad power supply system. bad power supply design - u will get all sorts of noise when u power it up. i have a sub woofer with the same problem(which in my case is the way it is designed). i used a delay circuit. but in ur case i know YSP-1 has a clean start up. so, if the warranty still covers it get it replaced. static noises, pop noises are often caused by bad capacitors.  

SOURCE: ysp-1100 clicks when power is pressed but does not turn on.

Sounds like a a pcb dry joint or a poor connection on a multiway plug / socket.

try removing and refitting all the pcb plugs - better still spray carefully with WD40

Goog luck, Gaz

SOURCE: YAMAHA YSP-1 SOUND PROJECTOR- LOUD STATIC NOISE FOR 30-60 SECONDS

had the same problem. Called Yamaha tech, They said try unplugging it it from the wall for at least an hour. That worked. Then it came back. My son the geek unplugged the cable where it goes into the unit and plugged it back in. Problem went away! So.... methinks it's as simple as keeping the contacts going into the wall outlet AND the plug going into the unit CLEAN. Here's a link on some good ideas on how to do that: http://www.naxja.org/forum/showthread.php?t=15476