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The only thing you can do that I am aware of, is attempt to remove the battery and unplug the system. Then remove your CMOS battery which is usually located under the keyboard.
If you do not feel comfortable disassembeling your PC then dont do it!
But, if removing the CMOS BAttery does not work, you might be out of luck. Improper installation or updating of your BIOS in many cases will render your PC inoperable, I hate to say that, but they warn you of this before the installation starts!
Let me know what you find or if you need more assistance!
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.
To reset the bios in a laptop you need to unplug the power supply and remove the battery. Once you do that press and hold the power button for 45 seconds then put the battery back on and plug it in and then try starting it. Everything in the bios will be reset to the factory.
BIOS updated successfully. 2L-1S-1L F1h The BIOS file size is not equal to the BIOS ROM size; wrong BIOS file. 1L-1S F1h The BIOS file can't be read; it is defective. 1L-2S F2h The model ID is mismatched; wrong BIOS file. 3S F3h The BIOS ROM has failed to be erased. Try to flash again. 2L-1S E1h The BIOS ROM has failed to be programmed. Try to flash again. 2L-2S E2h No diskette, or cannot locate the BIOS file. Try to use a new formatted diskette and copy the BIOS file again. 2S D1h