I've done this several times and it worked. When your Acer Screen come up go into BIOS, try the F9 key to load Setup Defaults then F10 to save and Reboot. Most of the time it finds your OS. Hope this works, let me know.
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there is problem with your hard disk. your hard disk wire may be loose. try to remove and refix all sata wires of your hard disk. "operating system not found" message may be coming because you may have not installed any os (windows, linux or mac) in your notebook. try to install operating to system to fix this. there may also be proble with your hard disk, your hard disk may be dead. if your notebook is showing message "operating system not found" without any reason then you may have put your notebook in high magnetic field area. due to high magnetic field, sometimes hard disk's are formatted automatically.
Apparently your Acer cannot find the operating system. As soon as the Acer logo comes up, there should appear in one of the bottom corners "F" & a number should appear. Immediately start pressing that F number (top row of keyboard). This should take you to a boot screen. Scroll down to boot sequence. Hit enter. Make sure boot-up sequence is CD or floppy drive first, second should be HDD, then escape. Restart computer. Should then boot off CD drive. I am assuming you have an operating system (XP, windows, etc.). Let me know if this doesn't work.
OK, best case scenario is your hard drive is corrupt, worst case, hard drive is dead.
What to do - you could download the hirens boot cd and see if you can rejuvenate the hard drive firstly by going into mini windows and check if you can see the C: drive in windows explorer, if you can thern running chkdsk c: /f might sort it for you.
There are other utilities in the hirens disc that could help but that's where I'd start.
If you're not confident doing this then you might need to take it to your local pc engineer.
Hi there, please restart your laptop when its booting press F8 key . You will find few option asking for selection. Select that by using up/down arrow key. Select " Last know good configuration" & press Enter. Next page asking for selecting operating system, for example: windows vista or Windows XP etc. Just select the operating system & press Enter again. ( Hope your laptop showing only one operating system ). Your laptop will start normally. After the if you seen the screen dark then press FN+Right arrow in key board(>). When you press FN + ( < ) or ( >) key that's time its working for brightness controlling for screen. Now if all well then fine other wise please let me know .
Another suggestion is run your Acer driver DVD for installing Display drivers. When finish restart your laptop and watch whats going. If no success then format the Operating system & reinstall again.
Do you have a backup disc i.e. an operating system disc! as it sounds like you may have to reload the complete operating system. If restore cant be accessed then you will undoubtedly will have to do a clean install!