4 beeps & red light on desktop fails to start

[Towle3288]

4 beeps & red light on startup.  Fails to start. 
I installed a new power supply and  reseated & added new ram. Cleaned the fan. Please help with next steps in repairing. 

[Garp_senchau]

@Towle3288, Welcome to HP Support Community,

Thank you for posting your query; I’m here to help by guiding you through steps to resolve this issue

Power reset your desktop computer

• Perform a power reset (or hard reset) of your desktop computer to clear information from the computer memory without erasing personal data.
• Turn off the computer.
• Disconnect the AC adapter.
• Disconnect all nonessential peripheral devices, such as printers, scanners, external hard drives, and USB flash drives.
  • Note: Do not disconnect your mouse, keyboard, or monitor.
• With the AC adapter unplugged, press and hold the power button for approximately 15 seconds.
• After you drain the capacitors, reconnect the AC adapter. Leave peripheral devices disconnected.
• Turn on the computer.

Next, follow the guide and look for the specific pattern of the beeps and blinks: HP Desktop PCs - Computer beeps or a light blinks during startup | HP® Support

I hope these steps help resolve the issue

Please feel free to reply here if you have any questions or if you need further clarification on any of the steps. 

Take care and have a good day. 

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Regards,