Operating system not found, cannot enter bios or boot to usb

[gagarasta]

Hello everyone, I had issues on my laptop acer 4752G

I'm using windows 10 until I decided to install windows 7 because of old hardware limitation, then I just found I cannot access my bios anymore. So far I already try these:

1. On system information its uefi not bios/legacy
2. Advanced restart but there's no uefi setting
3. Try to reinstall my pc using fdd but cannot enter boot selection
4. Press f2 f8 f10 only beep but straight into boot
5. Try reflash bios using fdd fn key+esc+power not success
6. Take the cmos battery off and wait 5 minutes and reinsert, no success
7. Reformat hdd in hope bios can boot into another device, this is where I messed up
8. Clone hdd with windows 10 to my laptop still not detected

After acer logo boot "text operating system not found" text appeared

I really avoid reflashing bios chip since I work far away from home.

Any suggestion to try everyone? Thank you.

[petehall347]

Re: Operating system not found, cannot enter bios or boot to usb

remove battery and try again pressing f2 ..if no go reseat the memory

[mcplslg123]

Re: Operating system not found, cannot enter bios or boot to usb

Try legacy seetings in bios.

[gagarasta]

Re: Operating system not found, cannot enter bios or boot to usb

still cannot enter bios, I reseat memory too even change them.

[gagarasta]

Re: Operating system not found, cannot enter bios or boot to usb

Try legacy seetings in bios.

Yes but the main problem is I cannot enter bios

[adamski1952]

Re: Operating system not found, cannot enter bios or boot to usb

If you try booting up with the cmos battery removed you may get the option to hit f1 to continue. or f2 to enter set up.

[Sephir0th]

Re: Operating system not found, cannot enter bios or boot to usb

Try with external keyboard

[gagarasta]

Re: Operating system not found, cannot enter bios or boot to usb

If you try booting up with the cmos battery removed you may get the option to hit f1 to continue. or f2 to enter set up.

Nice suggestion, I removed the cmos battery after 30 minutes turn it on without battery, but still booting like before cant enter bios ony beep when I press f2. Thanks anyway

[gagarasta]

Re: Operating system not found, cannot enter bios or boot to usb

Try with external keyboard

Yes I did

[gagarasta]

Ok guys, in the end I flash the BIOS Chip and everything is ok now, I really don't understand why the BIOS corrupted though, maybe about efi/uefi - mbr/gpt missmatch installation. There is a way that I miss to try, that is editing efi/uefi from cmd.

again, thank you everyone, this problem solved.