Aspire7-In bios I switched my SATA mode to AHCI & Black screen with underscore after entering bios.

DrKozel
DrKozel Member Posts: 2 New User
edited November 4 in Nitro Gaming

My question is:

In bios I switched my SATA mode to AHCI, and my bios doesn't work. I turn on the laptop, press f2 and I'm met with a black screen and an underscore at the top left of the screen.

Does anybody know how to fix it.

Thanks.

[Edited the thread to add model name and issue detail to the title]

Answers

  • William_mk2
    William_mk2 ACE Posts: 4,198 Pathfinder

    @DrKozel

    I am really sorry for the inconvenience..   Let us do the basic steps first..

    Doing the power drain and bios defaults will really help.  Kindly follow the steps given below:

    Turn off the laptop. Disconnect or unplug the charger cable, devices or any other cables connected to your laptop. Close your laptop. Turn it upside down.  On the bottom of the laptop, you can find a  pin hole. It is a tiny hole. You can a find a battery symbol indicator next to the hole. It is like a + and – sign symbol as though somebody is trying to shift the battery out. Insert the pin on to the hole for 30 seconds. Remove the pin. Flip the laptop. Connect the charger cable, turn on the computer.  Only on laptops where the battery is inbuilt you can find the battery reset hole on the back of laptop.

    If you don’t find a pin hole on the back of laptop then you might be using removable battery. There is no need to unscrew anything to remove the battery.  Turn off the laptop. Disconnect or unplug the charger cable, devices and any other cables connected to your laptop. Close your laptop. Turn it upside down.  On the bottom of the laptop, please look at the top or bottom depending on the way you look at it. You can find a long door. It is a battery removable door.  Just below that you can find a latch.  If you move the latch you can remove the battery door. Once the battery is removed, flip the laptop. Open the top cover, press and hold the power button for 1 minute. Connect the battery back on the back of computer. Connect the charger cable back and then turn on the computer. 
     
    If you don’t see a reset pin hole on the back of laptop or if you are not able to remove the battery (if it is inbuilt) then please unplug all the cables and devices out of laptop.   Hold the power button for 1 minute.  After releasing the button you should wait a while before plugging in power. Just because the button has been pressed doesn’t bleed off all the residual electricity on the motherboard. Wait 15-30 minutes before plugging in power. Then once power is connected wait for a full battery indication before turning the system on. That allows the battery to fully reset it’s internal statistics.

    Connect all the cables back and restart the computer.  

    While turning on the computer, tap f2. It will go to bios. Press f9 once. It will show load bios defaults with a yes or no popup. Press enter. Popup screen will disappear.  Press f10 once. It will show save changes popup with yes or no. Press enter. Computer will restart and it will load into windows.   
     
    It might also be the issue with battery, charger or power outlet.   Try to use the charger in a different room on a different power outlet.  Try to bypass the surge protector and connect it directly to power outlet.    Try to use an alternative charger if possible.    Try to turn on the computer without the charger and check it  ( as long as the battery is not drained out )  

    Try windows x 
    go to device manager 
    expand Battery
    right click on all the items below battery – uninstall 
    Restart the computer 
     
    It should work fine.. 

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  • Puraw
    Puraw ACE, Member Posts: 13,141 Trailblazer

    You need to get back to BIOS and change the Sata setting back in BIOS to RST with Optane. AHCI may have corrupted the boot sector on your HDD in which case you need to reinstall Windows from scratch.

    Try the battery reset options above either pinhole or disconnect the battery cable and press the power button 3 minutes, then reconnect the battery and try to power up. Make sure you screen is on, toggle F5/F6 (my latop) or the keys that switches your display to the external display port till you see the LED backlight a bit.

    If still no luck, with another PC download the latest BIOS for your PC from Acer support and transfer that to a bootable USB flash drive (see this video for an Acer computer), there are also many threads on this forum how to do that using Rufus.

  • DrKozel
    DrKozel Member Posts: 2 New User

    Thank you for your help guys, but...

    I forgot to mention that i did a dualboot with Windows 11 and parrot security os. After i uninstalled the parrot os. Bios started working. The bios works on AHCI but not with the dual boot. Im planning on installing the linux again so do you know how to fix the bios on the dual boot. Thanks.

  • iamfahadshaikh
    iamfahadshaikh Member Posts: 1 New User

    How did you overcome the issue, even i had dual booted my acer aspire 7 and due to some reasons I removed the linux, later when i again tried to dual boot or even connect a live persistence pen drive and initiated the boot/entered the bios, i am getting the same issue of black screen and a white underscore on top left. Please mention the steps of solution which you carried out.

  • Raj21_
    Raj21_ Member Posts: 1 New User

    Hi,

    I would like to add my experience here, i do not know this will work for other or not

    I have disconnected power source for 5 minutes, turned on the laptop, when the logo appears press F2, in that screen

    I could see windows, Linux, harddrive

    Linux was on priority 2, i changed its priority to 3 and restarted the laptop.

    After doing this, I could access my bios menu without any problem.

    Thank you.