HP250 G4 Black Screen Boot

[nyl417]

Hi everyone, I think I might need some suggestions here on a problem I'm having with my office laptop, a HP250 G4. A few days ago I started having this issue: when I press the power button, the CPU fan skyrockets to it's speed limit for about 60s without any display on the screen, then shutdown itself.

Battery does not charge. Can't boot from battery only, the PC must be connected to the wall to power up.

* Trying with HP support suggestions to discharge the PC by holding down power button and so on. Nothing changed.

* Connecting the laptop to an external monitor.

* Moving RAM sticks. Leaving only one. Switching to a brand new ram stick which is working on any other laptops I have. Removing both (nothing changed, not even a sound).

* Removing the drive. Changing with another (both with a clean install or completely unformatted). 

* Dust cleaning ..

* Resetting CMOS. Changed battery to a brand new one.

* As last attempt, I de-attached all cables and re-attached them. Also cleaned the cooling system and applied new paste. Nothing changed.

From time to time (two times, actually) the PC did actually boot into windows properly. It could reboot and be shutdown and booted again properly..  but when I unplugged the cord once, it refused to boot again for about a day. This happened the second time as well (after a lot of tries),  but actually isn't happening again.

What I've also noticed, is that the HDD_LED is always on if I connect a drive, while the PWR_LED on the motherboard is always off (except the only two times it actually powered) even if the CPU FAN is spinning, the DVD writer is powered as well as the ram, IO and HDD. So I proceeded to check the power cables and they are all fine as well.

I guess I have a "dead motherboard" at this point, or at least partially damaged?

[IT_WinSec]

Hello @nyl417

Welcome to the HP Support forum. Thank you for posting.

Thank you for the detailed troubleshooting and description.

Your guess right - your issue is related to the BIOS or motherboard. This is hardware problem.

I am afraid you will need to bring your computer (or ship it) to service - HP Authorized service center. If the computer is still under warranty, you will need to notify HP support first. If you are not sure where such a center is located, please contact HP support for assistance in finding one. Here is more info:

>> http://support.hp.com/us-en/document/c00372730

>> http://www8.hp.com/us/en/store-finder/find.do?bs=SR4&type=authorized

>> http://www8.hp.com/us/en/contact-hp/ww-phone-assist.html

Hope this works for you.

[Serwonu]

I just completed troubleshooting the same problem on the same model and it turns out that it's a dead 4Gb memory. So verify yours with my solution and probable a bad memory bank too.