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If all lights go out after the battery is inserted, the charger has entered pre-charge mode. In approximately 5-10 minutes, the orange and red lights should turn on indicating that fast charge has been initiated. If all lights remain off after 15 minutes, remove the battery. The orange light should glow. Reinsert the battery. If the orange light goes out when the battery is inserted and all lights remain off for 15 minutes the battery should be replaced.
Take a look at this document from Dell. You should have some diag lights on the front of the computer, and this should help you find what is not passing post.
This sounds like there is a problem with the battery. Remove the AC mains power and take out the battery from the laptop. Plug AC power back in and try booting the laptop up. If it boots up let it boot into Windows/linux and then shut the computer down as normal. Remove AC power and re-insert the battery. Plug AC back in and power it up, see if it does the same thing. If it does the same thing the battery is faulty. If it boots up with the battery in then there was a glitch.
shut down computer - unplug power cord from laptop - remove the battery from laptop - plug Ac adapter into computer and Ac outlet (wall)
turn on computer
if computer does not turn on, replace the AC adapter and cord - then place battery back into computer
plug in new Ac adapter and cord - recharge battery - if orange light stays on after 4-6 hours of charging battery, you need new battery as well - replace battery, charge it up and it should be fine
if you have attempted these steps before and no change occurs, then you may have issue with power connection in computer - locate a service centre to replace power connection on computer
i,d suggest that the power cut may have been a surge or spike.
This May have blown your power pack, and caused possible motherboard Damage.
** Did you use the same lead for the PSU** and have you checked the (main fuse in the Plug ? )
If the monitor light remains orange, this is a possible graphics card fault, or driver that is not allowing the monitor to come out of standby mode. You could try installing a different graphics card, or swapping the monitor cable to the on-board graphics card if it has 1.
If none of the above works, assume the motherboard has suffered damage.
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