As with many home theater systems, often times that means that there is a positive and negative connection touching somewhere. I might suggest, as tedious as this may be, unhooking all of the speakers from both the speaker side and the back of the unit, and re-inserting them. Usually a grounding of a positive and negative trips the "PROTECT" warning.
Keep me posted.
My system has been working great until last night. When I turn the system on, I get the "welcome to Samsung Digital" message, blue light comes on but immediately it powers off and as it is I get a message saying "protect". Any button I hit then goes through the same sequence as I just mentioned above. I can't get the system to stay on. My Samsung tv works fine and my tv speaker works but I can't use my sound system. Any ideas or advice? I find no mention of this problem in my manual unless I am overlooking it. "PROTECT"--what does this mean? Please help if anyone can.....thanx in advance!!