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Cannot access BIOS to change boot order

Last response: in Windows 7
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March 16, 2013 7:40:46 PM

I was trying to install Windows 7 from a USB stick and I went into the bios to change the boot order and now I am completely unable to get into the bios to change the boot order back. F2 F12 nothing is working. This is on my Dell Inspiron I17RSE-3589BK laptop. Operating System not found screen followed by an Exiting PXE Rom screen that constantly repeats and goes no where. I had changed the boot from UEFI to Legacy and now I just have no access to the bios settings at all. I've tried pulling the hard drive and restarting as well still nothing.
a b $ Windows 7
March 16, 2013 8:08:56 PM

you have to clear CMOS
March 16, 2013 8:10:59 PM

Any other way to do that other than pulling the CMOS Battery?
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a b $ Windows 7
March 16, 2013 8:49:48 PM

Pull the battery.

Go make a drink or sandwich.

Plug back in.

???

Win.
March 17, 2013 9:40:59 AM

I pulled the laptop battery over night and put it back in and get the same result. Looks like the CMOS Battery is the only option.
a b $ Windows 7
March 17, 2013 11:02:40 AM

Probably is the battery but try pulling the battery and holding the power button for 10 seconds or so
March 17, 2013 12:45:42 PM

So I've pulled the CMOS Battery and let the computer sit without it or the regular battery for an hour. I put both batteries back and get the same problem, still no access to BIOS and the same operating system not found stuff. Any ideas?
a b $ Windows 7
March 17, 2013 12:57:13 PM

Leave the CMOS battery in and pull the regular power battery out. Hold the power button down for 10-20 seconds.

Can you verify the USB drive is bootable on another system?
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