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The HP ProBook 450 G4 is a laptop computer made by the Hewlett-Packard software company. It was released in 2016 and has the model number Y8A06ET#ABF.

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Laptop will not power on

When I plug in my laptop in the power button and the caps lock button light up for a second or 2 then go out. Then the power button and the wifi and the mute button come on for a second or 2 then go out. This happens twice then the laptop becomes unresponsive. I have replaced the power supply but it still acts the same. I have tried the 30 second power button reset and no luck. Any ideas on what to do next?

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Hi,

Try a full power refresh in case it is a corrupted BIOS and check if that resolves the problem.

I realize that you said that you “… have tried the 30 second power button reset and no luck.” but sometimes it is necessary to remove the RTC battery (Real Time Clock) from the motherboard as well, to reset the BIOS back to its default state.

Here’s the procedure:

a). Disconnect the charger from the laptop if connected.

b). Disconnect the main battery from the motherboard.

c). Remove the RTC battery from the motherboard.

Here’s the maintenance and service guide for the laptop. Go to p.77 to view the necessary pre-requisite steps and then the procedure to remove the RTC battery. Unfortunately with your model you will have to remove the motherboard to access the battery.

When the battery is removed measure its voltage. If it is <2.6V DC replace it. The battery type number is printed on the battery. It may be a CR2032 which is commonly available everywhere

d.) Reinsert the RTC battery (or its replacement).

e). Reverse the above steps to re-assemble the laptop.

f.) When the laptop is completely re-assembled, connect the charger and try to turn on the laptop.

If it starts OK there may be a message about the date and time being incorrect. This is normal as the BIOS has been completely reset back to its default settings. Once the date and time have been adjusted the message won’t appear the next time that the laptop is started.

If you had previously changed any user defined settings in BIOS to suit whatever specific hardware configuration that you had for the laptop, then these will have to be set again.

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Well something worked I now get a 2 long 2 short beep code that should be a corrupted bios so now have to do that

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@ justin nicholass

Here's a link that may help

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Tried doing the battery trick again and now I get the 2 long lower tone beeps 2 shorter higher tone beeps then a pause and 3 long low tone beeps and the laptop turns off and not responding to anything unless I unplug and plug it back in again

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@justin nicholass

3 long beeps is a memory problem so try re-seating the ram and then check again.

What's the history on the laptop?

Wet, dropped, worked OK then failed, unknown etc?

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Tried reseating the ram no change. Laptop was working fine put away in a laptop bag and not used for a month failed to start on getting it back out again. Did get the 2.2 code then a 3.2 but the laptop shut off after the 2nd short beep where it had been shutting down after the 3rd long beep on the codes. About ready to give up and try a new motherboard

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justin nicholass さん、ありがとうございました!
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