Memory test passed but for more information I was told to visit this site

[Sta5kz201]

My laptop has been wet by rain while sitting in the car, now I cannot get it to start when turn on. It stays on a page that says boot device not found please install an operating system on your hard disk. Hard disk (3fo) 

[WAWood]

@Sta5kz201 

Turn it OFF and leave it OFF.

Here are some tips on dealing with liquid damage: http://www.makeuseof.com/tag/you-just-spilled-water-or-coffee-on-your-laptop-heres-what-you-should-d...

However ... it's most likely that SOME damage was done, regardless of how quickly you turned off the laptop and what you did afterward. The key problems are only the surface and almost certainly, more damage was done than that.

The ONLY way to know for sure is to take or send it to an HP Service Center and pay a LOT of money for them to run full diagnostics on it, and after that, to disassemble it to repair or replace any damaged components.

And, if the motherboard is damaged, the cost of repair can easily exceed the cost of replacing the laptop -- because (as far as I know) liquid spill damage is NOT covered under the warranty.

If you live in the U.S., here is a link to the HP Service Repair Centers:
https://www.service-center-locator.com/hp-hewlett-packard/hp-hewlett-packard-service-center.htm

If you live outside the U.S., here is a link to HP Service Centers, by Country/Region: https://support.hp.com/in-en/service-center