If your battery is dead will the computer not power on?

I have a MacBook Pro and I know my battery has been slowly dieing for a few months now. I recently had a new hard drive installed and the tech said it's done. This is the second one I've replaced. But my question is, why won't the laptop work without my battery charging properly? I just ordered a new battery but I'm now wondering if it's a bigger problem. Any advice?

If the problem is only a dead battery, your computer will work, it might slow down a little to prevent your MagSafe from being overloaded, but even if your battery has juice left enough to hold a few minutes it will run as new. Also, as you're ordered a new battery, everything seems just fine.
Just a reminder, calibrate your battery for best performance, at least once or twice a month.

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