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12-07-2023 12:10 PM - edited 12-07-2023 12:56 PM
during startup, the LED flashes 4 times and beeps 4 times. the computer does not start. if there is no electricity for several hours, it will sometimes start
12-07-2023 12:37 PM
Hi
Thank you for visiting our English HP Support Community. We advise you to post your question in English to insure a quick response for the Community.This can also help other users to take advantage of your post, in the case they have the same question.
Thank you for your understanding.
Regards,
12-07-2023 03:04 PM
Welcome to our peer-to-peer HP Community Forum!
According to p. 146 here: c04205252 (hp.com), that 'sounds' like a: "Power failure (power supply is overloaded)":
Please follow the directions as provided.
In order to best assist you, it would also be helpful to know how your HP Z420 is configured: what processor, RAM, graphics card (if any), etc. and what power supply you got installed.
Kind Regards,
NonSequitur777
12-08-2023 07:56 PM - edited 12-08-2023 07:58 PM
In order to best assist you, it would also be helpful to know how your HP Z420 is configured: what processor, RAM, graphics card (if any), etc. and what power supply you got installed.
Kind Regards,
NonSequitur777
12-10-2023 05:03 PM
Interesting, because your 600-watt power supply (p/n: 632911-001) is easily capable to power your PC.
If your issue were mine, I would try out a different (400-watt or more) ATX power supply in order to ascertain if your issue can be blamed on a faulty power supply.
Kind Regards,
NonSequitur777
12-15-2023 08:56 AM