HP Envy x360 won't boot

[Merriyuh]

I have an HP envy that just stopped (mostly) turning on one day. The power button LED will turn on, and the caps lock LED blinks 5 times fast, 3 slow. The fans don't turn on at all, and plugging the display into an external monitor does nothing. I have tried a hard reset, tried to open the BIOS recovery with win + B, win + V, and B alone as well as created a BIOS recovery USB and no progress. What else can I do?

[Hawks_Eye]

Hi @Merriyuh 

Welcome to the HP Support Community! We're here to help you get back up and running.

Thanks for laying out the symptoms clearly.

On HP laptops, caps lock blink codes are diagnostic indicators from the system board. The pattern you describe — 5 fast blinks, 3 slow blinks — is important.

What That Code Means

For most HP Envy x360 models (including recent generations), 5.3 blinks = General System Board Failure.

Unlike the simpler “2 blinks = BIOS corruption” or “3 blinks = memory issue,” this pattern indicates the embedded controller or system board itself has detected a critical fault.

That’s why your fans never spin up and external display shows nothing — POST (Power-On Self Test) isn’t even starting.

What You Can Still Try Before Declaring a Board Failure

Power Reset / CMOS Clear

Disconnect AC + internal battery.

Hold power button 30–60 sec.

If your model has a CMOS coin cell (some Envy x360s do, some don’t), reseat/remove it for a few minutes to clear NVRAM.

Minimal Boot

Pull out SSD and RAM, then reseat a single RAM stick in slot 1 only.

Try booting without SSD attached to rule out drive failure.

If it’s still 5.3 blink, not memory-related.

BIOS Recovery (You tried already, but confirm method)

Hold Win + B, plug in AC while still holding, then press power.

If recovery is possible, fans should spin and screen should flash, even if USB isn’t connected.

If totally unresponsive, the recovery block in the BIOS is corrupt or board logic isn’t even initializing.

External Power/Battery Check

If you have a known-good charger, test it.

Some HPs won’t POST at all with bad power rail detection.

If None of the Above Works

Unfortunately, with the 5.3 blink code, the official HP service manual states:

“System board failure – Replace system board.”

This means:

Embedded controller or chipset failed.

No field-replaceable fix besides board swap.

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Take care, and have an amazing day!

Regards, 

Hawks_Eye