The screen of my laptop goes black. i got it checked at the service center and they diagnosed it as the hard disk which was defective. after having it replaced, the same thing is still happening. i turn it on, but after 15 mins. or so it goes black again can you please help me??
I am having a similar problem with a desktop version of the motherboard. I have determined that it is a motherboard issue. The whole computer locks up when the video goes dark. The hard drive controller gives a steady read light, the keyboard is locked out, CD-ROMs will not open, the reset button is disabled and the mouse is frozen. I have swapped memory, video, dis-connected all but the most essential internal components. The power supply is a brand new 450W PS. No luck.I am thinking that it may be an AGP issue but am unable to get a PCI video card to work in the system so I have not been able to check that theory out. Just thought that I would share so that you can compare your symptoms to others who are having similar problems
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If your laptop appears to boot up and the hard disk LEDflashes, then the problem is probably a back light fault. This can be a faultyinverter or a faulty CCFL lamp. Please click on this link and follow myinstructions to identify the fault and possible fix :- http://www.fixya.com/support/r3598095-faulty_laptop_lcd_screen
Windows is not starting. Try to start in safe mode and if you can, do a system restore back to when it was working. If you can't do this, then you'll need to insert the system disk and boot from it and choose the option to repair your computer. I suspect that you have corrupt Windows files or a corrupt registry. Repairing it with the system disk should solve the problem. Either that, or you will have to do a reinstallation.
If you ever saw operating system logo such as windows xp then the issue is possibly with the hard disk. You will need to recover the system with your recovery disc in that case. If no system logo, then you may need to check the fans on CPU and make sure it is turnning ok when booting, also check the memory, unplug some of the memory stick and try or replace the memory. Then the hard disk. You can use a bootable CD or USB stick or floppy disk to boot and see if any of the hardware other than hard disk are malfunctioning.
The LCD screen may be faulty. I suggest you borrow a monitor to test your laptop if you do not already own one. If the laptop appears to boot up and the hard disk LED flashes, then connect an external monitor to the laptops video port. Power up the monitor and then boot up the laptop and the video information will automatically divert to the external monitor. If this works then you have a working laptop.
The first screen (start windows normally etc) appears because the computer ahs not shut down normally before. Since you choose to start windows (normally or last known...) and the Windows logo comes up with the loading bar, this means that the computer is starting to boot. Some hardware or software (windows) problem appears and the boot never ends. Possible reasons: motherboard failure or hard disk failure. A good idea is to re-install windows to check the results. Mention that in case of reinstalling the windows, during the procedure choose to reformat the hard disk so it will be checked for errors and reported.
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Possibly it's the internal hard disk. Try booting from a CD or an USB key. If it succeeds, boot off a diagnostic CD such as UBCD or CD Sleuth (or your OS recovery disk, if handy) and try diagnosing the hard disk.
If it does not boot from CD or USB key even when set up in the BIOS, it could be the memory (unlikely) or the motherboard South Bridge (more likely).
If it doesn't even enter the BIOS setup, it's either the BIOS firmware or the motherboard.
it could be the culprit but it could also be corrupt system files, bad hard drive, bad motherboard. There could be a number of reasons why your laptop goes to a black screen.
The best way to tell if your wireless card is shorting out the motherboard to cause it not to boot is to take out the wireless card completely from the laptop and then turn it on and see if it goes past the black screen, if it does then you know thats the problem, if it doesn't then it could be some of the other reasons i mentioned.
Right Click on Desktop select Properties select the Scree Saver tab Click on the Power Button which is on the right side select the power schemes In that select the power schemes options and choose "Never" for turn off monitor, turn off hard disk and system stand by click on Apply Repeat the above step for each option in "Power Schemes" then click on ok