Out of Box computer won’t start, has a blinking green light under the power button and beeps

[Nwilliams1215]

Just got this computer today, unboxed it, plugged everything in and when I click the power button, it peeps a sequence 5 times in a row then the beeping stops and the light flashes green. The sequence is 3 long beeps followed by 2 shorter beeps.

I have tried connecting to different monitors and none of them are appearing with a boot screen. All these monitors worked just minutes ago with my old PC. 

[Prométhée]

hi

contact the dealer
in general this code corresponds to a memory problem
By being very careful, you can always open and check if the modules are plugged in correctly

HP Desktop PCs - Computer Does Not Start and Emits an LED or Beep Code | HP® Customer Support

[Johnharper241]

One blink per second means that the power supply is off, or in cold redundancy. Cold redundancy means one power supply is in an efficient low-power state, and it is not activated until it is needed.

[Prométhée]

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@Nwilliams1215 wrote:

Just got this computer today, unboxed it, plugged everything in and when I click the power button, it peeps a sequence 5 times in a row then the beeping stops and the light flashes green. The sequence is 3 long beeps followed by 2 shorter beeps.

I have tried connecting to different monitors and none of them are appearing with a boot screen. All these monitors worked just minutes ago with my old PC. 

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 what are you talking about @Johnharper241 
as mentioned if it is this error code!

The red light blinks three times, and then two, short white light blinks (3 long red, 2 short white)

This condition indicates a potential memory failure.

https://support.hp.com/us-en/document/ish_1997210-1528385-16