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Sound like the LCD screen's inverter is causing an short/overload and the power adapter is shutting down (thermal cutout). Remove the LCD screen and connect an external monitor, power up the external monitor first and the boot up the laptop. The video should automatically on the external monitor. If the display on the external monitor is OK then the fault could be the inverter which is located at the bottom of the LCD screen between the hinges. LCD screens and Inverters for your laptop maybe available from this WEB site.www.lcdparts.net
Without the AC power supply connected (e.g. no external power supply), remove the battery pack to force a hard reset on the software controlled on/off switch and wait a few minutes before reconnecting the battery (and external power supply if your battery is flat): try to switch the unit on again.
Have u tried replacing or trying a different power supply? Sometimes when a power supply is going bad will not put out the right voltage for the internal switch to kick up the brighter setting. Therefore it still thinks its on battery mode. Test the voltage from the supply and compare it to the recommended voltage gateway suggest for that laptop.
1/ Take a close look at the display in bright light; can you see anything there? (If so then the CCFL (or its power supply) needs replacing on the display
2/ hook up an external monitor and see if that works (or at least if the light stays green on the monitor)
3/ Any boot beep? any "Windows sound"?
4/ try removing the battery and (using only external power) see if it starts.
4/ remove the battery AND the external supply, hold the power switch in at least 30 seconds. Hoojk it up again, try it.
remove the battery and remove the power adaptor ... press and hold the power button in the ON position and count to 20.
attach the AC adaptor only and press the power button ...this should fix the issue ... then re connect the battery.
if this does not work then add a external monitor .. if it lights up then hit the
Fn + F5 keys
Fn + This hot key cycles through the power-on
display mode options.
The display mode options are:
Built-in display panel only, Built-in display panel and
external monitor simultaneously, External monitor only.
Fn + This hot key cycles through the power-on display options.
The display modes are:
❖ Built-in display panel only
❖ Built-in display panel and external
❖ External monitor only
❖ Built-in display panel and external
video device simultaneously
❖ External video device only
First try a complete reboot, unplug the power and remove the battery for 30 seconds, then reboot.
if it still is dark the backlight may be out, try an external monitor to see if it works,connect the monitor and hold the FN key then press the switch to monitor button (F9 or F10, has a symbol on it) if the external monitor works you will need to replace the LCD screen or ballst (backlight power supply). voltage checks will tell you if the power supply is bad (do not attempt this unless you are comfortable taking it apart).
lastly sometimes the ribbon cable comes loose in the rear of the screen (inside) again will require disassembly to check and repair the cable.
If the external monitor does not work you may have a bad , video card, motherboard or memory.
The adapter does not have a switch. When you plug in the adapter into the laptop a LED lights up to indicate that it is connected to the mains supply and is charging.
When you boot up the laptop with the adapter connected and check the power setting from the Control Panel and if it indicates it is on battery power, then either the adapter is faulty or the connector is not making proper electrical contact. Wriggle the connector plug to see if the charge light comes on, if it does then the loose connector needs repairing.
Replace the adapter if it is faulty.