4 deep, long beeps and 3 high-pitched short beeps at startup

[Litocompresto]

My desktop fell in January.  Afterward, the beeping started, 4 deep beeps and 3 high-pitched beeps five times at startup, but it still booted up after the beeps.  I took the computer apart to see if something was jarred alose and found nothing, so I put everything back together.  Now, the display shows multiple screen colors such as red, blue, green, and white, and won't start where I can do a safe mode.  What should I do?

[Echo_Lake]

@Litocompresto

Thank you for posting on the HP Support Community.

Don't worry as I'll be glad to help, 
To get the answer to this question, blinking led lights cant be turned off. An LED or beep code usually means a basic function was unable to start.  

I have a few troubleshooting steps we could try to fix the issue:  (do not skip any troubleshooting steps even if you feel steps are repeating)

Firstly, perform Hard Reset:

• Step 1: Remove discs and devices
• Step 2: Perform a hard reset
• Step 3: Run hardware diagnostic tests
• Step 4: Refresh or reset your PC. Click here: https://support.hp.com/in-en/document/c04718479 to complete the troubleshooting steps. By the end of the article, you will be able to fix the issue.
• Click here: https://support.hp.com/in-en/document/bph07107  to know more about Computer Does Not Start and Emits an LED or Beep Code.

Hope this helps! Keep me posted for further assistance.
Please click “Accept as Solution” if you feel my post solved your issue, it will help others find the solution.