When I hit the power button, all the lights come on but the screen remains blank. It isn't in sleep mode and there is enough power because we have it connected to a power source. What else could it be?
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go to control panel > power options. Turn off hibernate and sleep mode, change all settings to never sleep and change the setting for "when closing the lid" to "do nothing" sleep mode, hibernation can destroy the registry on these laptops, you are better off turning that garbage off and just letting it run.
After replug the graphic card and switch on the pc & install back the graphic ... The power button remains green but the screen is black. ... From what i have noticed there is probably some issue with the thermal cutout ... Lights light up, Drive sounds as if working,
When you turn on your laptop do you see the P.O.S.T screen or it just remains blank? and also while booting up do you get any beep sound?
Try to boot your computer in Safe Mode by Tapping F2 (or Del in few laptops) key after pushing Power Button.
let me know what happens.
Power down, remove the battery, remove the power plug. Hold down the power button for at least 30 seconds. Remove and reinstall the memory module(s). Re install the power plug and try to power back up and see if it works. If it does, reinstall the battery ad you're done. If not, get back to me for some more ideas and further diagnosis. Thanks and have a good day! Ron