Hi Carl, I'm probably not going to help you but you may have helped me! I have had a similar problem with my Beolab 3000s, detailed here: https://forum.beoworld.org/forums/topic/beolab-3000s-switching-on-and-off-in-use/ Without any solution really. However your post has encouraged me to try something new, which is connecting via a not-fully-wired Mk3(?) powerlink cable. In fact BM6500 > PL3 > BL4000 > PL2 > BL3000, as the only PL3 cable I have is fairly permanently routed. Anyway, todays experiments are: BM6500 > PL2 > BL3000: rapid switching on and off started after about 30 minutes, and whether the display is turned on or off (Audio/Video/Standby switch) BM6500 > PL3 > BL4000 > PL2 > BL3000: currently been on for about four hours without switching off, which is the longest I've managed in a long time. No signal going to the displays obviously with the PL3 cable. So I think my BL3000 problems might be the same as yours, i.e. related to the display. My displays work fine until the switching starts, but then turn off until I give them a new input, e.g. change the volume. Do yours do the same? I'll do some more experiments nest weekend, including trying the other BL3000. I could live without the displays if the speakers work with powerlink, but I'd rather have the displays too! Dave  

It sounds like there is a short on the display board. Could you post a picture of it?

Apologies, lausvi, I'm not quite ready yet to take my amps apart. I presume you mean the circuit board not the display itself?

A degree of confirmation on this. I purchased a short powerlink Mk3 cable from Steve and so far my Beolab 3000s seem to be working fine. I'm going: BM6500 > MCL cable > MCL2AV > PL2>PL3 > BL3000 > PL2 > BL3000 The short PL3 cable is enough to break the link to the display so although the displays do not function, everything else seems to. Partial huzzah! Thanks Carl for pointing me in this direction, and I hope you have luck with yours.