Two weeks ago I had a small liquid spill on the trackpad and keyboard of my Macbook Pro (15" 2.53 GHz, Mid 2009) whilst it was running. I mopped it up but the trackpad became jittery/unresponsive and after a few minutes stopped responding altogether. At this point I forced shutdown by holding down the power button, and unplugged the machine. I've just opened the machine up and removed the battery to inspect for residue inside the Macbook, but oddly I could see none. I've not looked beneath the keyboard as taking the logic board out seems a big job. So I thought I'd reconnect the battery and try starting up anyway, but found the machine is completely unresponsive. The magsafe light glows orange, but the battery lights are all dead. I've left the magsafe connected for 10 minutes, but still no lights appear on the battery, and no startup. I've also tried disconnecting the battery and just trying to power up with the magsafe connected, but no joy. What should I try next? Does a dead or disconnected battery on this model prevent the machine starting up? (I've read conflicting advice about this when googling). Can I test the battery for life in any way when it's outside of the machine?