On the underside (bottom) of your MBP is a serial number. Go to this website and it will give you information on the model of MBP you have:
When you start the MBP holding down the OPTION key, do you see one or two HDD icons?
Chipmunk International BV | Home | Aanbiedingen | Produkt Overzicht
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Model introduced: 2009
Serial number: W89380AH9GU (cleaned up from 'W89380ah9gu')
Production year: 2009
Production week: 38 (September)
Production number: 357 (within this week)
Model Number: MB881
Machine Model: MacBook5,2
CPU speed: 2.13GHz
Family name: A1181
Screen size: 13 inch
Screen resolution: 1280x800 pixels
Memory - flavour: DDR2-S-800
Memory - number of slots: 2
Memory - maximum total: 6GB
Memory - largest module: 4GB
Toebehoren en uitbreidingen bestellen: Art# Prijs
2GB SO-DIMM geheugen Mac 200pin DDR2 800MHz A-3571 € 29,00 ex BTW
Power Adapter 85W voor MacBook (16,6v) A-4020 € 18,00 ex BTW
Factory: W8 (Shanghai China)
External link: Repair guide by iFixit
Uitbreidingen: Uitbreidingsmogelijkheden van dit apparaat
Please enter any (extra) information you have on this model in the box below. (Type of Mac, CPU speed):
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There seems to be an error with the information that the website gave. I suspect that this is a 13" MBP but this I do not think is important.
I'm fairly certain that the MBP will have Leopard or Snow Leopard as the OS. Are you communicating with me on another Mac? If so, does it have a Firewire port. If you do not know, can you give me information as to the model it is. Use the afore mentioned website and enter that serial number if you have to.
In the interim, look at this support article and go through the steps. If there is confusion on your part, post back.
If you get to the step that requires the installation disk, you have two options;
Call Apple customer service and give them the serial number of the MBP (and credit card number for the fee) for duplicate install disks.
Order from the Apple online store a Snow Leopard retail disk. You really should have one anyway. I think that this is preferable:
You also could make an appointment at an Apple store genius bar. The diagnosis is free. Any repairs require coin of the realm.