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1. 

   Posted by: jrichardson52
   Member

   When booting this laptop with no operating system will display "no operating system found" as long as the power adapter is not plugged in! You can go to CMOS and it will display whatever page you are on...until the adapter is plugged in! Once the adapter is plugged in the laptop screen will go black, no cursor...nothing. The laptop is running. If plugged into an external monitor, the external monitor continues to display.

   I have replaced the Screen and the Inverter, installed Windows 7 Professional, removed one of the memory modules, replaced the hard drive. As long as the laptop is running on the battery only it works fine. Plug in the adapter and within 5 - 10 seconds the screen goes blank. Remove the adapter, press Ctrl+Alt+Del and the screen comes back showing the user login. I have changed all of the power options for 'plugged in' to never, and have no screen saver. I have left all of the 'battery' power settings at default.

   Any ideas or suggestions will be greatly appreciated.

   Thanks,
   Jack

   Posted 1 year ago #
2. 

   Posted by: cyberion1985
   Member

   Hello jrichardson52,

   This is a nice issue and I would love to have that unit on my table right now ! Replace the Mainboard or the A/C adapter.

   As we can assume, the Mainboard controls the voltages and current for the LCD. Also don't forget that your LCD usually swaps to "power save mode LCD" when on battery and goes back on full usage once power has been restored. It also takes longer to start up when on battery (on most models)

   As mentioned by you, you've already replaced most of the components and with that said, there only a few remaining:
   *BIOS upgrade
   *Replace Mainboard
   *Replace CPU
   *A/C Adapter

   Please let me know the progress on that one :)

   Posted 1 year ago #

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