MacBook Pro failing to fully boot

Howdy,

I have a 13" MacBook Pro (Mid 2012) that is failing to fully boot.

What happens once I press the power button:

• Screen turns on, and the typical boot-up loading screen with the Apple logo appears
• Once the loading progress bar reaches about halfway, the screen goes black
• About 10 seconds later, the login screen appears
• I click on my account, type my password, and press enter

Now this is when the funky stuff begins....

• The computer does not transition from showing the password box to the loading bar
• Sections of the screen are now gray & green and slightly jittery

After roughly 2 minutes of spazzing out with along with the odd colors showing up....

• Screen goes black
• Fan is still fanning
• Repeated beeping noise

Annnddd thats when I hold the power button and come to you fellas for some help

I'm looking to diagnose the problem in order to hopefully fix it,

any help/recommendation/advice would be much appreciated.

Thanks