I thought I could see the pixels on the LCD all change briefly when you switched on the MPC. This tells me that the LCD is probably OK because it is at least getting the power it needs from the mainboard.
Unless that 'flicker' on all the pixels was just a reflection from your camera, but I don't think so.
The backlight inside the LCD is dead but that's a simple fix

I don't have an MPC3000 in front of me, but there seems to be something else wrong with that MPC. As Beatdiggerjazzcat suggests, this looks like something else - it could be a faulty OS chip, or an OS chip fitted the wrong way round (doesn't the OS problem cause some LED's to light at full brightness though?)
You definitely need a second opinion because I really don't think a replacement LCD will help here.
Things that need checking first:
- that OS chips are seated correctly
- that all connectors are present and not loose
- the voltages from the power supply should be checked
Also look on the back of the MPC and check if it is a 220-240volt model, stranger things have happened.
Can someone with a 3000 tell us which (if any) LED's light when you switch on the machine?
Cheers, Matt
Plug and play backlights for MPC60II/MPC3000 *and now for MPC60 Mk1*