Something is wrong with my 2009 MacBook.

What OS was the MacBook running before this was happening?

the 2009 MacBook is very old so I don't know if this is working but when you press cmd+R on startup, what is happening then, can you access MacOS recovery?

If not, do you have access to another Mac? The 2009 MacBook can run up to El Capitan I think. If you have access to another Mac you can make a bootable USB device with El Capitan to install the MacBook a new

How to download macOS - Apple Support

Download El Capitan here

Instructions for making a bootable device

How to create a bootable installer for macOS – Apple Support (UK)

You need to boot to an OS X 10.6 Snow Leopard DVD installer or from a bootable macOS USB installer. To create a bootable macOS 10.11 USB installer will require access to a Qualifying Mac. A Qualifying Mac will be one from 2008 to 2015, but you can confirm a Mac is compatible with macOS 10.11 by checking this article for compatible (aka qualifying) Macs:

https://eshop.macsales.com/guides/Mac_OS_X_Compatibility

If you have access to another Qualifying Mac, then you can use this Apple article to download & create a bootable macOS 10.11 USB installer (read the instructions carefully as there are several steps for extracting the 10.11 installer to the Applications folder):

Create a bootable installer for macOS - Apple Support

Once you have either an OS X 10.6 Snow Leopard DVD or a bootable macOS 10.11 USB installer, then you will need to properly prepare the laptop's internal drive. The process is slightly different for OS X 10.6 and 10.11.

For OS X 10.6 Snow Leopard you will need to partition & format the drive using the instructions in this article:

https://eshop.macsales.com/tech_center/formatting/Mac_Formatting_6-10_R3.pdf

For macOS 10.11, you will launch Disk Utility to erase the whole physical internal drive as GUID partition and MacOS Extended (Journaled).