For some reason, randomly my monitor will go black, as if the power got shut right off. The computer keeps running as normal, but the monitor itself will not come back on unless I force the computers power off and turn it back on. Any ideas? I have a Dell Inspiron 1521 with Windows Vista.
Its due to wahter problem its commen problem in a dell monitor u have to take ur monitor with a good electronic technision or if u have knowlged then u have change the id of u r ic in ur monitor & ur monitor will be redy to use
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Have you connected to an external monitor, just for fun? Try that, don't run off the battery, in fact, take the battery out. Use only the ac adapter for power. Now boot pressing f1 repeatedly until you get into bios. Just let it remain in the bios screen for a few minutes, long enough to prove you don't have a hardware problem such a s the inverter going out, etc.
Then allow it to continue to boot to windows. If it appears on the external monitor (may need to hit Fn+F5 or F&, to utilize both monitors), but not the system monitor, it's possible you've got a bad piece of hardware such as an inverter going out, or even the backlight failing.
If there's no image on either monitors, but you hear the usual sounds of windows booting up completely, it gets tricky.
First think is to update to most recent bios.
Floow the directions from the Lenovo site for the T20. Use the floppy image; it's just easier.
Let us know how it's going.
I'm a pro laptop repair/rebuild tech. If you own an external regular computer monitor or even a friend who does, connect the laptop to the external monitor and power it on. Your Toshiba will have an F key with a little icon figure of a monitor on it. Hold down the fn key and press that F key to transfer the laptop display signal to the external monitor.
If the external monitor shows your normal laptop screen as it would usually display, you have a bad laptop LCD and some other (as yet) undetermined problem. If the external monitor is black just like the laptop, then yout video/graphics card has failed and since it's closely associated with power up issues at the beginning of the startup cycle, is interfering with the laptop's ability to run the operating system because it never gets that far.
From what you've described, you're going to have a choice of sending the laptop to a motherboard repair service (if you go to eBay and type "Motherboard Repair Laptop" in the search window you'll see many choices) for a price between $100 and $200 or need to start shopping for new laptop.
-if you switch the computer on and it boots up and you hear the windows sound, this could be a possible video problem or motherboard problem -run the diags on the LCD, while the computer is off, press and hold "D" then press power button at the same time, if you see the colors red blue green without any problems then it is a motherboard or video card problem -another method to run the test is while the computer is off; preess and hold Fn then press power button, let the test run; when you see the question were colour bars displayed, press N, if you see the colors red blue and green without any problem then it is a motherboard problem or video card; otherwise it is an LCD problem -to toggle display on the external monitor press Fn then F8
try to connect laptop to an ext monitor if you will still be getting this problem. if yes uninstall and resintall the video driver. if not then LCD might causes the problem. try reseating the LCD cable if possible.
did the monitor turn off when it is in idle mode? it might be the monitor power options (it might have been set that when it is idle for an X minutes it will turn off). check the monitor power settings.
Is the monitor a LCD monitor and does it uses a power adapter?
If this is the case then it could be the power adapter that is faulty or if it is underpowered and the thermal overload cuts in then it switches off and when it cools it switches back on again.
Check the monitors power specs and the adapter should match the power requirements of the monitor or greater (ie. the voltage should be the same but the current rating should be the same or greater).
the lcd screen may be causing this. Try to connect the laptop to an external monitor and have both working at the same time by toggling Fn F8 on the keyboard. Wait until it goes black on the LCD. post back what happens. If the external monitor wont go out when the lcd does, the lcd may have to be replaced. If the monitor goes out too, it's a video card issue which may be resolved by reinstalling the driver.
If you're working on the computer when that happens, it's not probably a power setting. Try to update your BIOS to the most current version at the toshiba support website (support.toshiba.com) & see what happens. Fixes the issue most of the time