HP Z420 won't start up. Only makes 4 beeps.

Hi and thank you in advance for your help.

My Z420 Workstation won't start up.

I press the power button and nothing happens except the 4 beeps that it makes. No fans turn on or anything else.  Just the 4 beeps.   I have already tried unplugging it then replugging it back in.  I have also blasted air inside the computer to clean up any exposed dust that might be causing a problem.  I also unplugged each piece of ram and plugged back in again.

What should my next steps be to troubleshoot the system?

Please let me know.

Thanks so much.
demirmAsked:
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JohnBusiness Consultant (Owner)Commented:
4 beeps is normally a serious hardware error: Motherboard or Power Supply.

If changing memory / re-seating memory did not help, look to these two causes.

Can you start with a bootable USB key? I doubt it, which further points to the above.

Is the machine in warranty?
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RaminTechnical AdvisorCommented:
Remove the CMOS Battery to clear CMOS data (refer to the Motherboard's manual to clear CMOS). if clearing CMOS didn't fix the issue then as noted above it's a Hardware problem.
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dbruntonCommented:
Power failure.

See  https://support.hp.com/nz-en/document/c03599666  for information on how to diagnose if it is the power supply or motherboard.  Find the section on four beeps.
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nobusCommented:
here's how i handle such problems :
 http://www.experts-exchange.com/Hardware/Components/Motherboards/A_1945.html                  (Short-overview-of-how-to-troubleshoot-bad-hardware-when-a-pc-does-not-post)
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dbruntonCommented:
Solution both by dbrunton and John Hurst but dbrunton provides link to narrow which component is faulty.
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