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serkan111 Top Student
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presario v6420et 1 long 2 short serial beep sound

presario v6420et
Microsoft Windows 10 (64-bit)


Hi everyone,

I installed the old bios version on my computer.(presario v6420et)

The LED lights are on and  1 long 2 short serial beep sounding  and

blank screen when it starts again. Try a hard reset  but not any changes. 

Can you help me.

HP Support Agent
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presario v6420et 1 long 2 short serial beep sound


Welcome to HP Forums, this is a great place to get support, find answers and tips,
Thank you for posting your query, I'll be more than glad to help you out :)


As I understand the computer is not booting into the windows anymore,

To provide an accurate solution,
I'll need a few more details:


Have you performed any steps on your own before posting on the HP Forums?


Please click on the below links once you identify the blink code and resolve the issue:


Start with Restoring the BIOS, since the issue began after the Bios installation,


Troubleshooting LED Blink Codes or Beep Codes During Startup or Boot


Computer Does Not Start and Emits a LED or Beep Code


Keep me posted,

If you wish to help others looking for the same solution as you've found, mark the post as Accepted Solution.
If you wish to show appreciation for my effort, please click the Thumbs up icon at the bottom of my comment.
And I Hope you have a good day, Ahead.


I am an HP Employee

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