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It sounds like you might have drained your battery! When the car is running does the Cigarette lighter produce power? It should be working while the car is running. That would also explain why the car starts sporadically. Try leaving the car on for 40 minutes. That might charge the battery enough.
You can power the system from anywhere. For example, if you have a 12 volt gelcell, you could reverse plug it into the cigarette lighter. You don't need a big car batter is you are not going to run the start or headlights.
This is a common problem. Your alarm was on when the battery went dead. When the alarm activated, the hood/bonnet opening lever locks to prevent thieves from opening the hood in case the top is down. Some boxsters have a jumper post the pulls out near the fuse box. However, I do not think the 1997-1999s have this post.
Buy a male-to-male cigarette lighter adapter at the auto store. Connect between your car's cigarette lighter socket and the other car's cigarette lighter socket. Do not try to start the ignition or the any other electronics. You should not even need the key in the ignition. You should be able to pop the door locks with the remote and open the bonnet.
You may also need to recover your radio code: http://www.a2dvoices.com/realitycheck/porsche/
The best way to do this is to put battery voltage back into the system through the cigarette lighter. You can buy a battery charger at an auto parts store or walmart that is designed to charge the battery through the cigarette lighter. It will have a plug on it that insert right into the cigarette lighter. Let it charge a little, and try the button again. It will pop right open.
You have to charge the battery through the cigarette lighter. Go to an auto parts store or walmart and there you can buy a car charger that will plug into the cigarette lighter. Once the battery charges a little, you can pop the bonnet. Once you have access to the battery, you can use a heavy duty battery charger or replace the battery.
The cheapest way to get around this and get enough voltage into the system to open the hood is to purchase a cigarette lighter extension (about 3 feet) and cut off the female plug on the end. Strip the 2 wires back a few inches and attach one to the positive and the other to the negative on a set of jumper cables. Attach the other end of the negative jumper to a battery. With the keyless entry in hand, touch the positive cable to the positive terminal on the battery and press the unlock button until you hear the car doors click. Once it clicks, you should be able to use the hood latch to gain access to the battery.
If the cigarette lighter is an unswitched power point you could use it as a location to put a very small charge, just enough to get the hood release solenoid to activate. Years ago there was a device that was a male cigarette lighter power point at both ends and enough cable to go from car to car. DO NOT ATTEMPT TO DO ANYTHING ELSE EXCEPT OPEN HOOD, DO NOT TURN KEY TO RUN OR ATTEMPT TO START. ANYTHING COULD RESULT. MINOR OR MAJOR. THERE IS A COMPUTER MEMORY SAVER THAT MATES A 9 VOLT TO A MALE CIGARETTE LIGHTER PLUG THIS MAY NOT BE ENOUGH TO RELEASE HOOD BUT MAYBE WITH A 12 VOLT FLASHLIGHT BATTERY (2 6 VOLT BATTERIES) WOULD WORK TO OPEN THE HOOD. (TURN EVERYTHING OFF EVEN DOME LIGHT.)