My 13.3" macbook pro will not power up.The battery indicator light does not come on.The Mag safe charging light flickers green and red dimly.I had a cell phone connected to the USB port.

Reset SMC. http://support.apple.com/kb/HT3964

Choose the method for:

"Resetting SMC on portables with a battery you should not remove on your own".

Try the suggestions in this article.

http://support.apple.com/kb/TS1365

If this does not help, you may have to contact Apple.

Best.

This didn't work for me, so I did a bit of searching and TONS of pages later in google, I found an answer. Here are the steps for people who also were in my situation:

1. Take off bottom case

2. Unplug battery - blurry image here: http://i.ytimg.com/vi/03cC79r5Dx4/0.jpg

3. Press and hold power button for 5 seconds

4. Plug a charger in, and it should start booting up

5. After shutting down again, reconnect the battery and close the case up

6. It works! (hopefully, if you guys had the same situation I did)