I'm on 3.03 OE-C, I think.
I haven't used my psp in a while, and now, I boot it up, the Power light comes on, and the memory stick flashes like normal. The lcd screen lights up to say it's on, but I don't get a welcome screen thing, or an XMB.
So, I insert and UMD and you hear the disc drive whirring away, but still, no screen.
I can access recovery mode, btw.