Unable to Power On the desktop. 3 long beeps and 4 short beeps are coming when switched on

[Shikhar11]

Unable to Power On the desktop. 3 long beeps and 4 short beeps are coming when switched on 

[Bill_To]

Greetings @Shikhar11 

Welcome to the HP Forum.

A 3:4 POST error is described Here.

You would have to test the MB in a minimum configuration.

A minimum configuration is:

1. Try all factory memory modules but do one stick of existing RAM, one at a time, in each memory slot.

2. Existing graphics card or use onboard CPU graphics (recommended), if applicable.

3. Existing power supply.

4. Existing CPU.

Then replace each core component per above with a known good replacement component, one at a time, until the PC will POST. 

The MB could post after disconnecting all unnecessary: drives, any add-in PCIe cards, the WIFI module, and unnecessary front panel USB connections. This would suggest one or more of the auxiliary components is/are causing the POST error.

Sometimes the MB is the bad component.

It may be wise to have a local PC Tech find the faulty component if the warranty period has expired.

Regards