I think I may have broken my PS2...
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Edit: It just randomly decided to start working again. FFS on a stick with cherries on! I was looking forward to having an excuse to buy a PS3 =P
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If any of you can cast your minds back to this topic from nearly two years ago, I have several consoles but a TV with only one SCART input, so I invested in a many-to-one SCART switcher which ended up causing weird things to happen when I, you know, actually used it. So I invested in another with manual switching, which nevertheless also caused weird bullshit to take place when I so much as dared to use it for its intended purpose (i.e., plug more than one thing into it and the consoles will - WTF - supply power to each other, and cause interference on the screen).
Well, today I decided that perhaps weird things might not happen if I hooked everything up through composite->scart adapters - i.e., it takes normal video/2xaudio RCA plugs and turns it into a SCART plug.
Alas, it was not to be. I tried plugging in a freeview box (SCART), a PS2 (composite), my precious modded Mega Drive (SCART) and an Xbox 360 (composite) and the switching didn't work right, so I got rid of the switcher and just cable-tied the damn cables together so they won't get lost. I've no idea whether any crazy power-supply bullshit happened because I didn't plug in my DC, which will spin the fan and boot the VMU when it does.
Since the experiment, the PS2 will no longer output a signal. It works, in that it will turn on and the drive laser will move about convincingly, but that's about all I can tell.
Have I fried it? If anyone has an answer that doesn't involve either testing the PS2 with another cable, or testing the cable with another PS2 (both of which I have but are several miles away...) it would be much appreciated.