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My cpu stops while working on computer ,I have to restart my pc and sometimes no screen remains dark ,sometimes monitor screen is very dark and slowly it becomes normal. I have shown to hardware person and he has told me that your motherboard is not working

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Install new regulator in your computer to perform your computer faster.

Posted on Sep 16, 2010

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I have lenovo g550...my screen flickers in every 5minutes...


Failing Inverter An inverter, typically found inside a laptop computer, consists of a small board, which has impregnated electronic circuits stamped on it. Inverters look like thin boards about the of two sticks of chewing gum. The inverter and its bulb control the intensity of the liquid crystal display, which lights the screen monitor. The computer can control the output voltage of the inverter and either lighten or darken the screen. A special type of inverter can adjust the brightness of the screen by using an internal sensor to judge the room brightness, and then adjust the screen accordingly. Failing inverters give off some specific warning signs, which can be recognized by observing different screen characteristics.

Short Intermittent Display Upon turning on the laptop, the screen flashes on in the normal mode for a short period and then blinks to black. A very faint image appears in a dark background, which will be very hard to see almost invisible. After shutting off the laptop and restarting, the same mode occurs, where the screen appears normal for a few seconds then fades to black. This condition points to a failed inverter. To confirm this, plug in an operational external monitor; if the external monitor functions, the inverter has failed. b> Total Blackout with Ghost image b> The laptop turns on, as indicated by the power supply button, but the screen comes up black. The screen comes up black after restart. You might be able to detect a very dim or ghost-like image on the monitor. When you plug in a known functioning external monitor, the external monitor operates normally. This mode of display indicates a failed inverter. b> Long Term Periodic Operation b> With this failure mode, the laptop screen illuminates normally upon start-up and remains that way after several minutes, hours or even days, until it goes very dark again. Brightness controls or restoration attempts do not work. Most often, the screen will function normally with a computer restart, but will eventually return to black. Faint ghost images might appear, as seen in the total blackout mode. b> Dark With Color Variation b> Upon computer start-up, the monitor shows black or dark gray, accompanied by very faint images. The screen might have an intermittent color change, or remain on with a non-standard color variation, like pink or red. b> Auto Control Switch b> If the screen appears black, with no faint or ghost images, look for the lid switch near the back hinge. The switch, when depressed with a closed lid, shuts off the computer and monitor functions. Sometimes the switch becomes stuck in the closed position, disallowing the computer and monitor to turn on when opened. Pushing the switch manually several times can often free it up. If the switch tab has broken or jammed inside the case, it needs replacing. b> Loose Connection In this mode, the display looks normal upon start-up, but tapping the side case of the computer turns the screen black. More tapping results in the screen functioning normally then cutting out again. This condition points to a loose wire connection from the inverter to the LCD backlight lamp, or the video cable. The connectors can be accessed by removing the monitor bezel screws and pulling the plastic retainer off. Both connectors can be cleaned and refitted.

Feb 10, 2013 | Lenovo G550 PC Notebook

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My dell inspirion 6000 laptop screen goes black but sometimes I can see the windows screen but it's very dark. When I attach it to a desktop monitor it works fine but the laptop is still dark. Sometime the...


The back light is the whole of the screen, the screen is illuminated by a CCFL lamp (fluro tube) on the bottom of the screen. A inverter supplies high voltage to this CCFL lamp.
If your laptop appears to boot up and the hard disk LED flashes, then the problem is probably a back light fault. This can be a faulty inverter or a faulty CCFL lamp. Please click on this link and follow my instructions to identify the fault and possible fix :-
http://www.fixya.com/support/r3598095-faulty_laptop_lcd_screen

Feb 08, 2011 | Computers & Internet

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My screen is not working although the computer turns on with all the lights


When you
When you power up your computer and the monitor screen remains dark, the problem can be either be associated with your monitor, or your computer power supply/video card/motherboard or CPU. Perform the following tests to isolate the problem to either the monitor or the computer.
1. Turn off you PC and monitor. Then verify that the 15 pin video data cable connectors are fully inserted into their receptacles on the rear of your PC and on the rear of the monitor and they are tightened down. (on some monitors the data cable is hard-wired to the monitor). Then make sure that both your monitor power cable is securely plugged into a working AC power receptacle. (You can temporarily plug a lamp into your AC power receptacle to make sure you have a good source of AC power).
3. Turn on the power switch on your monitor. The amber colored LED on your monitor should come on. Then turn on your PC. The fans in your PC start to run and continue to run and the LED on your monitor should change from amber to green.
???
Now if the monitor led remains amber and the screen stays dark you either have a bad monitor or a problem with your video card, motherboard or processor.. Try using a different monitor. If that doesn't solve the problem, you need to have a PC technician test your computer.
If you have any additional questions contact me by clicking on the "Add a comment" link located under your problem description on FixYa. Also, if you believe that this information was helpful to you, please return to the FixYa website and rate my response to your question.
Best regards,
Yavacotech

Jan 23, 2011 | Computers & Internet

1 Answer

Hello Sir, I am using DELL E173FP LCD monitor. My CPU absolutely fine I see initially booting thing on my monitor display then it gets black. I can hear starting sound of Windows XP, that too is fine. When...


You might need to change the screen refresh rate. Go do Control Panel> Display> Setting> Advance, choose 60 Hz. In order to make your Monitor able to display, restart the PC, press F8 on the keyboard frequently upon splashing ( 1 or 2 seconds after PC restarts). Select enable VGA mode by pressing up arrow of the keyboard> press enter. The display should look bigger, then you can start adjusting the screen refresh rate to 60 Hz

Apr 09, 2010 | Dell E173FP 17" LCD Monitor

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My brightness control does not work just turned on and can not hardly see anything it is up and running what now


Have you tested it with an external monitor?

I would say you either have a damaged inverter board or screen baclight lamp. Usually the inverter board fails in one of the following ways:

1. When you turn on the laptop, the screen lights up for a short period of time and then goes dark. You still can see an image but it is very dark, almost invisible and definitely not usable. When you restart the laptop, the screen lights up and then goes dark again. The laptop works fine with an external monitor.
2. Your laptop turns on but the screen remains dark all the time. You still can see a very dim image outline. The laptop works fine with an external monitor.
3. The laptop screen works fine for hours or even days, but sometimes it goes very dark as it mentioned above. When you restart the laptop, the screen works fine again.

Inverter failure symptoms are very similar to backlight lamp failure symptoms and in most cases you cannot tell which one is causing the problem until you replace either the inverter board or the backlight lamp. From my personal experience, inverter boards fail more often than backlight lamps. If you have to guess, replace the inverter first.

Mar 24, 2010 | Dell Inspiron 1545 Notebook

3 Answers

VERY Dim screen after a drop


Have you tested it with an external monitor?

I would say you either have a damaged inverter board or screen baclight lamp. Usually the inverter board fails in one of the following ways:

1. When you turn on the laptop, the screen lights up for a short period of time and then goes dark. You still can see an image but it is very dark, almost invisible and definitely not usable. When you restart the laptop, the screen lights up and then goes dark again. The laptop works fine with an external monitor.
2. Your laptop turns on but the screen remains dark all the time. You still can see a very dim image outline. The laptop works fine with an external monitor.
3. The laptop screen works fine for hours or even days, but sometimes it goes very dark as it mentioned above. When you restart the laptop, the screen works fine again.

Inverter failure symptoms are very similar to backlight lamp failure symptoms and in most cases you cannot tell which one is causing the problem until you replace either the inverter board or the backlight lamp. From my personal experience, inverter boards fail more often than backlight lamps. If you have to guess, replace the inverter first.

Mar 24, 2010 | Sony VAIO VGN-NS190J/S Notebook PC

1 Answer

When I turn on my computer the monitor remains dark unit after about 10 mins then I get the windows desk top. If I shut down the computer (normal shutdown)then restart I get the normal startup...


Try connect your monitor to some other box and try if it works the same way or as a normal pc boot. If it works well with other box, the issue is with the BIOS. Get the BIOS flashed with the latest version of flash program for the Bios chipset which your board is using. If the monitor shows the same symptom on a different box too.. you may need to get your monitor repaired. Good Luck

Feb 14, 2010 | ASUS P5PE-VM Motherboard

2 Answers

Broken screen, external monitor via VGA won't


Press "Fn+F7" once, wait a few seconds, and press it again, to "cycle" through all the possibilities (LCD-only, VGA-only, both).

Try the monitor with some other computer (desktop or laptop) to see if the monitor works at all.

Restart your computer -- does the initial "splash" screen (showing CPU speed and RAM-test) show? Does the "Windows" screen (with the crawling worm) show on the external monitor?

Nov 16, 2009 | Lenovo 3000 N500 Notebook

1 Answer

Screen is on, but does not appear to be on


The monitor was broken. I returned it to the vendor for replacement. Your tech did not seem to feel it was a monitor problem and only focused on the video card - although I asked him directly regarding his confidence of it being a videio card problem versus being a monitor problem.

I will not use your service again.

Mar 21, 2009 | LG 22" FLATRON LCD Monitor

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