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Possibly a RAM issue or errors on the hard drive stopping the display driver from working properly. Remove power sources, remove RAM and hard drive. See if you get a display when the power adapter is reconnected. If you do, remove power source and fit RAM, (if not motherboard may be faulty). Repeat and if still working, remove power, fit Hard Drive and boot again. Assuming your OS is Windows Based; Reboot and use safe mode run CHKDSK/F and when finished check the drivers.
Try to turn off your system. Then remove the cables and battery on the laptop. Then press and hold the power button for 8 secs. Then, reinsert the cables and battery on the laptop. Then, press the power button to turn on the laptop. If the HDD light flickers continuously, then the problem is on the Hard Drive. One way of resolving it is to Re-Seat the Hard Drive. If you know how to tear down the system, here's how. Turn off the laptop, remove the cables and battery at the back. Remove the screws located at the corners of it. Then remove and reinsert back the Hard Drive. If it still fails, contact ACER to immediately replace the Hard Drive. If you don't know how to tear down the laptop, then call ACER also for repair....
Does the splash screen come up? Most of the time if it is your hard drive the ACER splash screen will come up and then a Hard disk 0 error after that. If nothing appears on the screen then you have a bigger issue.
Is there any noise at all (Fan, hard drive spinning)? If so try hooking it to a external monitor to see if there is any movement. You might have a problem with your LCD.
I recently had Acer Aspire One Laptop with very similar symptoms: No screen, no lights (those that indicates activities) except Power button. I first thought the Hard Disk is dead but it's not.
I contacted Acer helpdesk in Australia and they have sent me a document with BIOS update and instructions. I did what it says and then the laptop is back to normal. Yours may have the same issue - need BIOS update.
The Aspire One BIOS update requires a FAT USB drive with the updated BIOS and the BIOS Flash program, plugged it in, press and hold 2 buttons: Fn and Esc, then press Power button for a while.
You should seek Acer Support website. But you may need proof of purchase.