Solved How do I fix black screen at boot?

April 28, 2019 at 06:18:01
Specs: Windows Vista
How to fix Toshiba L355D black screen at boot with no bios, no external monitor and no BCD or Windows instalation media working? I tried every possible quick fix or life hack from ever tutorial and forum I could find on the subject. I checked that the RAM was seated correctly and also tested it in a seperate PC, as well as testing other RAM in my L355D. I'm down to the motherboard now. I've already pulled the board to attempt to reset BIOS and CMOS. I may need to update BIOS to current version but not sure how to go about flashing it. There's also the GPU or CPU could be malfunctioning and need replacement but I think before I do that, I may as well try to reflow. If it's determined to be the Processing Chip, I will replace. Not sure if pulling the CMOS to reset the BIOS will work or if I even should try. Is there a better way to troubleshoot symptoms for these repairs using multi meter or CMOS reset to avoid having to detach from motherboard and if so, then what do I do please. Thank you for taking the time to help me. I would appreciate any advice.

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#1
April 28, 2019 at 06:30:07
"I tried every possible quick fix or life hack from ever tutorial and forum I could find on the subject"

Try this, might be lucky & fluke a boot.

How to use a Lazesoft Windows Recovery CD or USB device to fix the boot problems if your Windows operating system does not start correctly.
"It is very common for PC users to be faced with a Windows crash. When this happens, the dreaded 'Blue Screen of Death' pops up, or your PC has a black screen and can not boot or start up"

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Lazesoft Recovery Suite Home Edition video tutorial
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Tutorials
http://www.lazesoft.com/guide.html
How to Boot a Computer from a Lazesoft Recovery USB Device
http://www.lazesoft.com/create-a-bo...
How to Burn a Lazesoft Recovery CD
http://www.lazesoft.com/burn-a-boot...

message edited by Johnw


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#2
April 28, 2019 at 08:03:46
✔ Best Answer
"I've already pulled the board to attempt to reset BIOS and CMOS"

Laptop security is different than desktops. Removing the CMOS battery on a laptop board will not reset the BIOS.

You mentioned reflowing. I tried the following trick as a last resort & it worked for me, but it assumes the laptop at least shows some signs of life (lights & fans). Wrap the powered-on laptop (connected to AC adapter) in a towel or blanket & let it get hot. Check it occasionally to confirm it's actually getting warm. Let it sit like that for a few hours, then unplug, let it cool, & try to boot.

Also see the following thread: https://www.computing.net/answers/h...

BTW, based on the age of the posts & the fact that you listed Vista as your OS, your laptop is pretty old. It may be time for "last rites".


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