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Solved Can't get rid of ubuntu

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Hello,
I have a very old Samsung NP300 laptop, on which I wanted to install a clean windows 10 version, upon using my bootable USB drive it wouldn't remove old settings no matter what I did, so I decided to remove it completely via installing Ubuntu as my OS, the removing Ubuntu by reinstalling windows 8.1 this time, which turned into a complete nightmare.
I downloaded the latest Ubuntu 22.04 os and burned it to my Usb flash drive using rufus, then installed it as my new OS, and it started giving me errors and missing files, which I didn't care for since I had planned on removing it again right away by installing the windows 8.1 version, which I couldn't do because the device won't boot from anything, not a USB drive or a DVD drive, and when I pressed f2 for bios settings it gave me the grub list, or a boot menu with Ubuntu as the only boot option.
I then googled how to remove ubuntu from your computer and how to reset bios, the best option I found was to format my hdd completely, then remove the ubuntu folder from the efi partition, which didn't work and my PC still booted only to the (boot menu --> Ubuntu) screen, I then found a post that suggested completely formatting my hdd including the efi partition, which also didn't do anything, next I tried to install windows 8 on my hdd as an external hdd via CMD, and reinstall the windows bootloader, which all went well but when reconnecting my hdd to my laptop it still gave me the boot menu--> Ubuntu screen and nothing else.
How do I remove the Ubuntu boot option from my laptop and reset my bios settings, as the problem seems to be that ubuntu did something to my bios and now I cannot access it to change anything and my computer can't boot from anything at startup.
P.S: I tried removing the motherboard battery but sadly the laptop is extremely old and the screw holding the battery in place won't come loose, so I really don't think a hardware resent is an option here without causing more damage to the device itself.
 
Try downloading some partition software, like minitool Partition, AOEMI Partition, or even Gparted ( linux Based) make bootable media (USB), boot from the drive, wipe all partitions on the drive ( NOT format but total wipe). Most motherboards have a key to press to give you boot drive options, you may need to look up relating to your computer. ( Try tapping F10) Also since its older laptop make sure any bootable media is set to MBR not GPT as the older BIOS may not recognize it. Once drive is completely clean the new OS will sort out the correct format on its own, you don't need to pre format the drive.
 
Try downloading some partition software, like minitool Partition, AOEMI Partition, or even Gparted ( linux Based) make bootable media (USB), boot from the drive, wipe all partitions on the drive ( NOT format but total wipe). Most motherboards have a key to press to give you boot drive options, you may need to look up relating to your computer. ( Try tapping F10) Also since its older laptop make sure any bootable media is set to MBR not GPT as the older BIOS may not recognize it. Once drive is completely clean the new OS will sort out the correct format on its own, you don't need to pre format the drive.
Thank you but I already did all this, clean via CMD, then format into ntfs and partition, then make bootable usb drive with windows 8 and another one with windows 10, then when neither worked I installed windows 8 on the hdd as an external hdd via CMD as well, then installed a new windows bootloader for the device to boot from in case Ubuntu had caused a bios reset and the computer boots from the hdd first now, none of these worked. no matter what I do the computer gives me the samsung screen then shuts down, and when I press f2 or f10 or esc or ctrl+f10 or f4 they all take me to the same screen that says Boot menu--> Ubuntu and that's it.
 
Why not remove the HDD access the BIOS and make the changes that way?

Should take you to the BIOS since the system is not reading any type of boot device.

Another thing that you could do is connect that drive via USB to another system and use windows to zero out the drive.
 
Why not remove the HDD access the BIOS and make the changes that way?

Should take you to the BIOS since the system is not reading any type of boot device.

Another thing that you could do is connect that drive via USB to another system and use windows to zero out the drive.
I cleaned it on my other laptop as an external HDD, and accessing the bios is my problem, the pc won't access bios at all, with an hdd attached or without, it just takes me to the Boot menu--> Ubuntu screen, even with Ubuntu still installed I tried accessing the bios via grub and it wouldn't, the moment I installed Ubuntu it denied me access to my bios and even after I removed it I still can't get to the bios settings.
 
Something does not add up here
I do not know of any computer that allows software to access the bios.
You need special equipment to do that.
If you are getting a boot, then you must have either a cd/dvd or a usb plugged in
OR it is reading from the hard drive - NO other way it has to read from something, and it CANNOT be the bios.
As I have asked before when you shutdown are you holding the power button in until it powers off
 
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Something does not add up here
I do not know of any computer that allows software to access the bios.
You need special equipment to do that.
If you are getting a boot, then you must have either a cd/dvd or a usb plugged in
OR it is reading from the hard drive - NO other way it has to read from something, and it CANNOT be the bios.
As I have asked before when you shutdown are you holding the power button in until it powers off
Yes I am, thanks for trying to help me but I took the laptop to a tech specialist and he told me that the newer versions of ubuntu have a bug that fries the bios chip on some laptops, that's why the moment I installed ubuntu the only boot option was to ubuntu itself. Apparently the only way to fix this is via a chip replacement. Thank you and everybody else who tried to help me with my issue.
 
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Reactions: Wainuitech
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