OptiPlex 755 denies access to the boot sequence menu.

Found a weird problem on an Optiplex 755 Desktop Tower System.

I can change other values available on the system, but cannot get into the boot sequence menu.  The BIOS that was on the system was A17.

Updated the A20. No change.

Oh. It wasn't later. Upgrade to A21.  No change.

Downgraded to A12.  No change. Faced A21. No change.

Demoted in A10. No change. Faced A21. No change.

Decommissioned at A01. No change. A21 encountered no change.

If there is a password on the system when I tried to access the boot sequence menu it reminded me that I needed to type first. After correctly entering this value, the guest went away, but I still couldn't get into the boot sequence.

I removed the battery cmos for 20 minutes while the system has been disabled, it put, started. No change.

I replaced the battery cmos with that of another system.  No change.

Tried another keyboard. No change.

The jumper to reset the cmos.  No change.  A run the utilities on board.  No error could be found.

If I hold the Enter key while on the boot sequence menu I can see the screen initial start-up and glimmers of it will not advance to the next screen.

Unplugged the system and pressed the button for 30 to 60 seconds. No change.

I think it's ripe for a replacement under warranty.

Event_Horizon.

I know that this response comes a little late, but for someone else has this problem...

IT CAN BE FIXED!

This problem seems to arise after a BIOS updated completely flashing properly. That leaves the user unable to change the boot device priority in BIOS, causing therefore the machine complaining that there, there is "No Boot Device available"

Making level and the average standard BIOS downgrade do not seem to work; However with some switches it can be done.

First of all, you need the BIOS first release, A01 (O755-A01. (EXE), currently available from http://www.dell.com/support/home/us/en/19/Drivers/DriversDetails?driverId=R164252

Second, you will need also the latest version of the BIOS, A22 (O755-A22. (EXE), currently available from http://www.dell.com/support/home/us/en/04/Drivers/DriversDetails?driverId=2DWTY

Lastly, you need a USB stick or hard drive which is able to boot the machine in DOS. It is recommended to use the free 'Rufus' tool to create a bootable FreeDOS. Rufus is currently available at https://rufus.akeo.ie/

In addition, you may need to install jumper on the motherboard service mode; This repair was completed successfully with him helped, although it * might * work without it installed, although this has not been tested.

First create a FreeDOS using Rufus bootable USB device. When complete, copy the two BIOS A01 (O755-A01. (EXE) and BIOS A22 (O755-A22. (EXE) to the root of the memory stick.

Insert the memory stick into the computer, and then press F12 for BIOS. Boot from the USB key. Once at the DOS prompt, type:

O755-A01 - wipeall - wipeclean

Press on enter and follow the prompts on the screen. After the BIOS has been flashed, the computer must restart. Go into the BIOS and check the options under system boot sequence. The boot sequence should now not only display the name of your hard drive, but will be variable, allowing your computer to start normally. Set up your BIOS Setup to your liking (including date and time setting) and save it then & leave. After the reboot, press F12 again and start once more the USB device.

Flash the BIOS A22 the standard way by typing O755-A22 pressing on enter. Follow the prompts on the screen. Once the BIOS has been flashed, check the settings of the BIOS again to make sure that the Boot Device menu is always available.

Once finished, be sure to remove the rider of mode of service (if installed).

FAQ

Why it works?


From what I can tell, the previous BIOS flashing tool includes switches that later versions are not. -wipeclean - and wipeall are an integral part of this fix works as they completely erasing all the BIOS settings that are not usually deleted when the BIOS is updated. For some reason, Dell has removed these BIOS update tools options later.

In addition, the previous BIOS flashing tool actually flashes the BIOS itself DOS rather than rely on the BIOS RAM loading and then Flash with routines in the BIOS of the current system. I have no idea if that makes a difference in the process, but I imagine that it allows more options to pass to the routine of flashing.

Sorry for the long post, but I hope this helps someone! Having recently put his hands on a couple of these machines and having the same problem, it's incredibly frustrating.

Tags: Dell Desktop

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