Black screen with caps lock light on

Laptop is on but screen is black and caps lock led on.

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Hi, Can you turn the caps lock led off by pressing the caps lock key? Try connecting an external monitor to see what it displays.


Hi I can't turn caps lock LED off and that is no signal on external monitor



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Try the following procedure to get your laptop going.

1. Remove the charger from the laptop.

2. Remove the battery from the laptop.

3. Press and hold the Power button on the laptop for 30 seconds to drain any residual power from the laptop.

4. Connect the charger to the laptop, ensure that the power outlet is turned on and then turn on the laptop by pressing the Power button. (The battery should not be in at this stage)

5. If the laptop turns on, allow it to boot all the way to the Windows desktop. Then shut it down in the normal manner.

6. When the laptop has shutdown, switch off the wall outlet to the charger and remove the charger from the laptop.

7. Reinsert the battery into the laptop.

8. Reconnect the charger to the laptop and make sure that the wall outlet is switched on.

9. Turn on the laptop and see if it starts.

10. If the battery indicates that it is charging allow it to fully charge before disconnecting the charger.

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Hi jayeff. Thank you very much. It was helpful. Your solution worked perfect.

But this is what happened next.

If laptop goes to sleep and I opened it everything worked. If I normally restart computer everything worked. If I normally shutdown laptop and turn it on in next 30 minutes everything worked. Then I normally turn it off and turn it on after 8 hours it was black screen again. After I tried your solution about 10 times it's alive now. I left it on all the time. Any idea what problems it can be?



My initial thought, if you are not leaving the charger connected when you turned it off, is that the battery is not holding its' charge. It is starting to fail. Not that I wish for you to try it for the 8 hours again but if you can remember what the battery charge level is when you switch it off, then check to see the battery charge level when you turn it on again, that will show how fast it is discharging when off. Normally it should be minimal as the battery is not maintaining anything. Even the BIOS settings and the date and time settings are being maintained by a different battery. It is normal for batteries to have a very small internal discharge circuit which unfortunately increases as the battery gets older. Also the 100% of a new battery is more than the 100% of the same older battery if that makes any sense to you. The battery's capabilities have dropped but the measurement does not reflect this. Does it get to 100% when the charger is connected? How quickly does it discharge to say 50% when you run the laptop on the battery only? This is actually a better reflection of the capabilities of the battery. You will notice if you had two to compare that a new battery takes longer to discharge given the same load than an older one. Sorry to bore you with all this but I hope it helps you to understand better what I mean.

The laptop from what I can gather has only been released for about 3-4 years. Have you had it about this length of time? If so, and you use it a lot on the battery only, then perhaps you should purchase a replacement battery. They do not appear to be too expensive, Even rechargeable batteries have a life span.

Also I hope that you have remembered to do a backup of your data and do a 'system image' as well. That way if it fails before you get a new battery and you cannot restart it then at least when you get the new battery and in case things somehow got corrupted with your system you can at least restore it back to what is was at the time you did the system image.


Thank you for your advice.


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My toshiba p845t had the same problem. No matter how I try, still no lock, and the bad thing is that CMOS button battery hid under inside, I open the bottom cover, but I don't want to take the whole motherboard out, it's too troublesome, so I cannot reset CMOS the button battery. I knew it's the BIOS problem, after I drained out power, sometimes I can get the screen back, but after shut down or restart, it went back to blank screen. Here is what I do to fix mine by flashing BIOS:

1. download the newest BIOS, make a bootable CD, surely if you get a chance to open Windows, you can run Windows version BIOS setup. Unfortunately, this toshiba BIOS driver won't work with Windows 10.

2. Hold ALT+F10 key before turn on power, hold them tightly, wait 1 or 2 or 3 miniutes, hold until computer reboot itself, and then you will got Toshiba screen, hit F2 key right away, get into BIOS setup, change boot from CD ROM first, save and reboot. Put in that bootable CD, and restart computer, if you get blank screen again, turn off power, and do alt+F10 key again.

3. Computer will boot from CD ROM, and go to DOS mode, on the command prompt, just type Flash or something similar, which depends on the CD content you've downloaded. After BIOS flashing, it will restart itself. hit f2 key and go to BIOS setup again, change boot to Hard drive first. Save and reboot. My computer cannot find bootable device, so I went back to BIOS setup again, change hard drive settings, try 1 at once. I changed boot Mode, and everything runs great, even better than before.

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