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When I turn on my Lenovo g400 there is no screen display but the power led is on and the fan is running, I force shutdown then after twenty or more minutes I turn it on then its work again but when I shutdown properly and try to on thre is no screen display again pls help me
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Electro-mechanical fans make noise when wear and tear create sufficient gaps between the mating surfaces to cause vibration or axial movement of the moving part. Fan replacement is the most effective solution, and if you are not a good diy-er send it to a laptop repair shop. You may some tips in the Thinkpads forum where some chaps tinkered with their noisy fans.
Restart your computer and then press and hold F8 keys until you get Advanced Options menu screen.Use the arrow key to highlight Safe Mode, and then press Enter, your computer will boot automatically to safe mode. If you able to start in the safe mode then Scan your computer for viruses. Some viruses can cause a black Screen , especially ones that infect the master boot record (MBR) or boot sector. Update drivers for your hardware. black Screens are hardware or driver related so updated drivers could fix the cause of the STOP error. Return BIOS settings to their default levels. An overclocked or misconfigured BIOS can cause all sorts of random issues, including black screen. If it doesn't helps you then simply get the system utility program like PC Fresher that will fix windows errors that cause of black screen screen
Here are some of the steps to you can reboot your pc without using a keyboard:
1) Long press the power button - Press the power button for about 3-5 seconds. If the power LED or power supply fan shuts off, that means you have successfully turn off your pc. Press it again to turn on.
2) Unplug the power cord from the power supply - Force your pc to shutdown by unplugging the power cord from the power supply of your pc. Put it back again and press power button to turn on.
Note: Please make sure you have saved important activities before doing this as this will immediately turn off your pc.
In your case it is very difficult to find out which is causing the system not to power, this can be multiple devices on your ssytem.
trying to eliminate one device after another try following the steps below:
>remove the Battery from the system, unhook the adaptor as well then Press and Hold down the power button for 7-10 seconds to drain any power on your motherboard.
>after power draining the system connect the adaptor to your laptop, do not insert the battery yet, Power the system without the battery, if the system turns on leave it turned on for about a minute then shut it down normally.
>insert the battery to the laptop turn the system on if this turns on without any error then your concern is probably ok and fixed.
>but if the system still does not power up having the battery connected to the machine a device on your system can or maybe damaged either the Battery or the Motherboard having an issue with the battery conencted to the machine...
if your system is in warranty call Lenovo and have it sent to teh service center for proper checking and repairs.
When systems power off suddenly, always suspect - the power first. I would then look at heat and physical connections next as culprits. Memory errors almost always show up as blue screens. I say try a new power supply and see what it does. Its not a lot of money either way.
Run CPUID Hardware Monitor and watch your temps. You will have to turn logging on or you will lose the data in a crash. Make sure your CPU heatsink is still connected properly. Things have a way of working loose.
most likely its something to do with cpu not being correctly placed causing it to overheat which will make the fan run really fast to try and cool it but if it shuts down then it isnt getting enuf cooling, and if you kept pressing the power button you have destroyed it from the heat
If all the parts of your computers are fined functioning. This is a CPU problem witch is no display. Try to disassemble the CPU remove the heat sink the CPU and clean and insert it again. When you are now inserting the CPU be sure that you will put a thermal past in the heat sink so that the heat from the CPU are absorbed. If the heat will not be absorbed it will cause overheating.
Sounds like your graphics card and display are not properly communicating. If the card doesn't sent out a signal to the display, you will see nothing on the screen. Did you check the graphics card on another machine using the same display? If so, something different may be wrong. I am assuming your display is powered on and plugged in properly. If there is more than one video connector on the machine, you may have it plugged into the inactive video connector. If all of this checks out I suspect you have some hardware problem with the system unit.
This could be a variant of, or a newer (or older) version of the "DMD fan failure" message.
Symptoms I had are, I stop hearing a fan when the message is displayed.
Then the temp LED keeps flashing RED until I either try to turn the TV on again,
Or turn MAIN power off/on again. BUT it repeats when I try to turn the TV on.
The picture appears normal until this happens ( about 15 sec.)
The solution is to FORCE a normal shutdown by hitting the TV off button
before the message appears.
You should see the power LED flashing RED/GREEN (cool down) and then RED (standby).
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