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If the computer is under warranty you should take it to Dell. If not you can try removing the battery and try to turn it on. If that does not work then you might have to open it up and remove hard drive and memories to see if that helps turning on. My best advice is take it to a service center.
If its only 3 mnths old should still be under WARRANTY take it back if its not under warranty
Turn Off the computer now as soon as you hit the power button, keep on holdingAlt key & keep on tappingF10 key ie: Alt+F10, it will open the recovery console select full factory restore and follow on screen instruction. (Note:this will erase all datas on the computer) or
During the boot process you will see on the screen to press a certain key to enter setup usually delete or the F2 keythis will differ depending on which bios you have
Press and hold that key during the boot up process to enter BIOS using the arrow keysyou can load failsafe defaultsor load optimized defaults press escape then press f10 to save to cmos to restart
if the power button is flashing and wont power on, remove all other device that is connected, like LAN cable, mouse, etc., remove battery and power.. leave it for like a minute or two. power on the computer w/o the battery and connect power cord directly to the wall outlet. see if that will work if not bring computer to a local tech for hardware repair, and if computer is still in warranty you can call the acer for hardware warranty repair.
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The three flashing lights indicate the battery is dead. Since it still wont power up with the cable plugged in I'd say the port has gone. Try wiggling the adapter about in the port to see if it begins to charge. If not then you would need to take it to a laptop repair centre to get a new dc port soldered on or buy a docking station.
sounds like the d/c adapter was either installed backward or the wrong part was installed, also check the connector on the new power cord to the laptop, you may have gotton an incorrect power cord. because what you describe is the internal power system is shorting out. take battery out and check it with a volt meter , if the is no volts/or negative volts on the battery ,it has gotten internaly reversed , and needs replacement.
Check to make sure your touch pad is not turned off. Regarding the keyboard you need to check to see if you have set the laptop to work off an external keyboard. Check the function keys at the top of the keyboard they are used to turn on and off the keyboard and mouse functions
there are combinations of function or "hot keys" for enabling or disabling these functions. The NuLk is a combo of the functin key and the NumLk key pressed simultaneously. The scroll lock is the one keeping your mouse from working properly.
I'm not familiar with your particular unit to advise which keys are necessary to disable Scroll lock, but they should be marked.
Also, some notebooks have a switch to disable the mousepad...Usually indicated by a light located above the pad itself.