Laptop won't run on AC power

Hi,
I have a Compaq Presario CQ50 and just ordered a replacement battery. When I get it, I plan on only using it when I need to. The problem is, my laptop is not seeming to be able to run on solely AC power. Every other laptop I know is capable of running without the battery in it, so I'm thinking that either my budget-priced laptop was designed poorly and is incapable of this feature, or that something is wrong with my laptop and I need to send it in.
To be precise, it does actually run for a few seconds on AC power, when I boot it up. But when Windows tries to start, it shuts off. Just a detail worth mentioning.
Thanks,
Roman 

This is usually a symptom of a bad power jack.
The part looks like this:
ebay
Sorry to say your jack is soldered to the motherboard and it is a pretty big job for the end user to try to fix it.
repair service
There are numerous repair services on the internet and you might have a shop right in your town that can do it.

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