That is not enough information to know the answer.
Wattage is not the key piece of information here, we need to know the Voltage, the Amperage, the type and size of the plug and the plug's polarity in order to know for sure.
Even then, we wouldn't know 100% because you gave us a generic model number. There are literally 100's of different computers with the Compaq Presario 2500 moniker. From the Presario 2586US to the Presario 2592EN. Without the EXACT model number, we cannot tell you for sure.
Your best bet would be to purchase one of the universal power adapters that are compatible with your computer. Just bring the laptop with you when you go to buy it.
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Answers & Comments
That is not enough information to know the answer.
Wattage is not the key piece of information here, we need to know the Voltage, the Amperage, the type and size of the plug and the plug's polarity in order to know for sure.
Even then, we wouldn't know 100% because you gave us a generic model number. There are literally 100's of different computers with the Compaq Presario 2500 moniker. From the Presario 2586US to the Presario 2592EN. Without the EXACT model number, we cannot tell you for sure.
Your best bet would be to purchase one of the universal power adapters that are compatible with your computer. Just bring the laptop with you when you go to buy it.