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How to get display working and fan quiet?

OK I don't work on laptops often but was asked to replace the keyboard on this HP laptop. I did this because one key was broken and so I had to unassemble everything with no real experience and reassemble it again in the new laptop keyboard. I was able to do so with some ease but after I got everything plugged in, I didn't get a display but the keyboard lights are on and after a little bit the fan starts going until it reaches max speed.

Things I have already done to troubleshoot:

Checked all display and cpu fan connections

Reseated all cables, ram, and cpu/heatsink(haven't reseated all the ribbons)

Checked if it displays on an external monitor, it doesn't

I wanted to flash bios as it seemed like this could be a corrupted bios issue but the manual doesn't show how, and I have no real experience with doing so.

Any help or suggestions are great. Thanks!

(also note its not my laptop and I wont be able to test any theories or methods until atleast til this Monday)

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Also I did actually reapply thermal paste in case it was overheating but that doesn't seem to be the issue but just more info

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crwdns2933897:0crwdne2933897:0

Hi @user23412

No display, internal or external indicates that the laptop is not passing POST (power on self test) or if it is it's not booting into the OS.

Can you get into BIOS with a working display? To get into BIOS turn on the laptop and quickly press f10 or quickly press Esc, and then press f10 when the Start menu is displayed. Note: External monitor doesn't work in BIOS mode, only internal i.e. laptop screen

Did you disconnect the battery from the motherboard, first thing after opening the case, before commencing to disassemble the rest of the laptop so as to replace the keyboard?

Try a full power refresh as check if that resolves the problem in case a corrupted BIOS is the cause of the problem.

  • Disconnect the charger from the laptop (if connected) and then open the laptop and disconnect the battery cable from the motherboard and then disconnect and remove the RTC coin cell battery from the motherboard.

Here's the maintenance and service guide that will help. Go to p.46 and p.75 to view the procedure to remove the battery and the RTC battery, respectively.

  • Press and hold the laptop's Power button for a full 30 seconds and then release it.
  • Reconnect the RTC battery, reconnect the battery, reassemble the laptop, connect the charger and check if it turns on OK

If it does there may be a message stating that the date and time are incorrect. This is normal as the BIOS has been reset back to factory default by the above procedure. Once the date and time have been corrected, the message won't appear the next time the laptop is started. Also any user definable BIOS settings that were altered by the user, to suit whatever operating requirements were needed, will have to be changed back also.

If it still doesn't work, what's the motherboard model number (printed on motherboard) e.g. 6050A3316601-MB-A01 or similar? Knowing this will help to find the schematics for the motherboard which will be needed to find out what's wrong.

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crwdns2944067:03crwdne2944067:0:

Thanks for such a quick response. I cannot get into BIOS and I did remove the battery first thing before disassembling the motherboard. I will definitively try a full power refresh when I get back on Monday. If that still doesn't work hopefully you can help to continue to troubleshoot and help find the real problem. Thanks a ton @jayeff

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@user23412

If it doesn't work, don't forget to look for the board's model number and post that back here.

Cheers

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Thanks @jayeff, I know its been a little bit but I did try your solution, it unfortunately didn't work. I have been working on this laptop for over a week and a half and have been forced to give it to an actual IT pro at this point.(I am a student working on it). Thanks anyways for all the help so far.

Cheers

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