HP Laptop Black screen

HI Experts,

Was performing a cleanup on a HP laptop, I was in the BIOS turned off Secure boot mode and can longer boot into anything. I was attempting to boot to internal CD to run memtest but it wouldn't boot I cant boot from any cd at all ....

I can hear the fan on boot and see that a backlight is on screen but nothing happening. Black screen, no cursor, googling led me to pulling battery out holding down power for 15 secs but to no avail  no safemode no bios.... please help!!!

thanks in advance.
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TemodyPickalbatros, IT ManagerCommented:
can you remove the BIOS battery and Laptop battery also for 5 minutes
remove Ram and clean it and plugged it again
noxchoGlobal Support CoordinatorCommented:
First try to press on power button for 10 seconds. Then remove the Battery and power connection. Wait for some time and connect them back, try to boot.
If this fails open the case and remove the BIOS battery as suggested above.
AndrewPartnerAuthor Commented:

Thx for your responses....

Noxcho: Tried your options first as I had yesterday but no go.

Temody: will pull out Ram and BIOS battery today as per your suggestion and see how that goes the removing of Ram had crossed my mind but I didn't have access to my tools yesterday.

I will post back later today cheers.
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noxchoGlobal Support CoordinatorCommented:
Does it show any onscreen texts when starting? If not then get a dvi cabled external monitor and connect it to the output on the laptop. Does it show anything on it? You can have simply videocard failed.
AndrewPartnerAuthor Commented:
No non at all just a black screen but slightly backlit enough to know it is on... I thought that as well & plugged in a vga cable but nothing happens trying to locate a HDMI cable to test that as well.
try also an external monitor

here is what i do in such cases :
here my laptop troubleshooting guide, i hope it helps you :
- remove all external devices
-you can disable devices from BIOS to test (sound, lan, etc..)
- if no display - test with an external monitor
- test if it runs from battery alone, or from AC alone
- test also with a known good battery !
***some laptops have a reset button - if you have one use it!
- remove battery and AC adaptor, hold power button for 20 sec, connect AC and reboot --> any display ? if NO -->
- disconnect all disk and cd drives, battery , and other cards and peripherals, leave only 1 ram stick
- boot -->any display ?
-if you can access the bios battery, remove the battery, AC, and bios battery for a minute to reset the bios
or test it, it should read 3 V
*** you can test the disk on another pc, if you like !

===>>you can test if the mobo works outside the casing, connected to power and external video  !

you can also remove and reseat the video plug - it sometimes comes loose

for troubleshooting the display (LCD) problems : http://www.lcdparts.net/howto/symptom.aspx
AndrewPartnerAuthor Commented:
Great advice thanks nobus will be keeping that info in mind good troubleshooting advice.

But as I was unable to get to the BIOS I gave in and ended up speaking with HP.... since it falls under warranty so sending back to them after trying a few different things, not the desired result but since I am unable to access anything except the ram and wireless adapter I don't want to risk the wty by pulling apart.

that's the best, since you've gat warranty
don't forget to close this...
AndrewPartnerAuthor Commented:
Sorry for late reply wanted to see what happened after sending away, the customer has had laptop delivered back to her in a working order but slow as a wet week but at least has a new mobo....

Once the customer has backed up the data that she forgot in the first instance I am going to restore to factory settings and see if any difference in speed thanks for you suggestions guys suggestions in closing off points wise?? happy to give some out for assistance...

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noxchoGlobal Support CoordinatorCommented:
So it was a failed motherboard. As for the points, you can select one or several comments as assisted. Or simply delete the question if no solution was given.
AndrewPartnerAuthor Commented:
Although the solution was not provided by the participants some helpful advice and much appreciated assistance was given.

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