HP Zbook Turns on with a black screen and the fans are working hard- anything I can do?

[MatHat]

Greetings,

I recently found that my power was being drawn from the battery, even though it was plugged in. I think this has been happening since day one, but I was not using any power taxing programs at the time. When I saw that this was happening I decided to find a way to fix it. One suggestion was to:

1. Turn off the Laptop
2. Unplug everything
3. Remove the battery (mine was an internal battery)
4. press and hold the power button for 60 seconds.
5. place the battery back in and turn it back on.

I did as such and turned it back on. It turned on, the screen stayed dark (off), fans ran loudly as if stuck in some process, and caps and num lock blinked five times and the computer. It seemed like it was stuck trying to turn on, since when you turn on most computers the fans blow a little and then turn off and the computer boots up. In this case the fans keep blowing and the computer never boots up, only stays on.

Here are some other things that I have tried:

1. Realized that I had some things still plugged in. I took them out, repeated the above process, and still nothing. 
2. I removed the battery and only used my AC adapter plugin. Although the laptop still did not work, it seems that my power draw problem was fixed- it will now run using a plug in only... not exactly useful now that my computer does not turn on. 
3. I tried pressing F10 repeatedly and no screen ever showed up, as if it was stuck in booting up mode. 
4. I removed the RAM and waited a little, and then placed it back in. 

Nothing so far, so any help would be appreciated. 

Thanks

[kwBrad]

I am having the same issue, it just happened last week. The laptop had been working fine with no issues, I was using it and it was in sleep mode. I attempted to turn it on to take it to another room to charge and just got a very loud fan with no boot up, no lights and no screen.

Thought it might have been a heating issue, let it sit for the night and attempted to turn it on the next day, with no success.
The laptop doesn't have an external battery, thought I would try to remove and reinstall the battery, is an internal battery something that could be removed easily, or it would have to go to a service depot?

Following this thread to see if anyone has any advice or has experienced this issue.

Thanks in advance!

[MatHat]

Taking the batter out should not be a problem. Mine was an internal battery. But it was only after I had done this that my problems started! Perhaps it was because I had my ethernet cable still plugged in? I read that you ought to unplug everything before removing the battery. 

In the end I had to take my laptop to a computer technician. Basically, they were unsure what exactly happened. They said while it was possible that my updating the drive could have possibly caused the issue, their method of restoring the computer should not have worked if it was the issue. Nor was the issue due to heating, since computers are meant to take lots of it. Basically, it seemed like a strange fluke with the system.

But what worked was removing the RAM and the BIOS battery, which is not the same as the main computer battery. This reset the computer startup BIOS and the HP sure start, which should have not stopped working. I had read about this online, but thankfully I did not try digging into the guts myself. The technician said that my HP Zbook, was not designed to remove parts easily. You had to take off the keyboard, then take of a bunch of other interior components before you could reach the RAM and the BIOS battery. Then he had to half-rebuild it in order to test it out- he first placed in the batter and turned it on to see if it work. It did. Then added each piece of RAM to see if any of them were the culprit, which none seemed to be.

On total, they did about 2 hours of digging- which cost me much less money than I thought I would have to spend, and headache (or damage) had I tried to attempt it myself. It only takes one "oops" and lack of insurance to really mess things up, especially on a tight budget. 

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