Suppose we'd try and see if some resets are in order?
These should do: NVRAM Reset:
"Shut down your Mac, then turn it on and immediately press and hold these four keys together: Option, Command, P, and R. You can release the keys after about 20 seconds, during which your Mac might appear to restart." (Should chime two times.)
• Reset NVRAM or PRAM on your Mac - Apple Support
https://support.apple.com/en-us/HT204063
There's the reset for SMC 'system management controller'
With Removal Batteries: "Lifewire's" article, to the point:
• Resetting SMC ( System Management Controller) on a Mac - with removable batteries | lifewire.com
https://www.lifewire.com/reset-smc-system-management-controller-on-mac-2260840#reset-the-smc-on-mac-notebooks-with-removable-batteries
Apple laptops with removable batteries include the 13-inch, mid-2009 MacBook,
all MacBooks, and MacBook Pros introduced in early 2009; and before. (2006)
1.Shut down the Mac.
2.Remove the battery.
3.Press and hold the power button for Five seconds.
4.Release the power button.
5.Reinstall the battery.
6.Turn on the Mac by pressing the power button.
Apple Support's SMC reset article was revised & clouded.
[Details got more complex as time passed, and new things
were added to the instructions; those were simpler before.]
Safe mode on start up is more straight forward of these.
Often 'log-in' required as part of start-up into Safe mode.
• How to use Safe mode on your Mac - Apple Support
https://support.apple.com/en-us/HT201262
Instructions for 'Intel-based' Mac models:
- Turn on or restart your Mac, then immediately press and hold the Shift key as your Mac starts up.
- Release the key when you see the login window, then log in to your Mac.
- You might be asked to log in again. On either the first or second login window,
you should see ”Safe Boot” in the upper-right corner of the window.
4.Read through article content... to see if you should've done other steps(?)
..And then exit Safe mode [by use of 'normal' restart] is all that's required..
PS: got batteries/magsafe? OWC: OWC lists replacements for this model
also has Apple authentic MagSafe1 power adapters at reasonable cost.
Good luck & happy trails! 🤖🌻☃️❄️