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unable to modify boot devices


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#1 sniper8752

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Posted 24 April 2016 - 09:07 PM

I have a dell precision 490.  i rest the bios to factory defaults.  I can't boot from dvd or usb.  i tested the dvd on another computer, and it works fine.  also, when i hit enter in the bios to modify the boot order, it does not allow my to modify it.  there are no passwords set.  

 

can someone please advise?  thanks!



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#2 mjd420nova

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Posted 24 April 2016 - 09:38 PM

Check the battery for the CMOS.  It's a "coin" type cell in a plastic holder.  The BIOS can not save any changes if it has no battery voltage.



#3 sniper8752

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Posted 25 April 2016 - 05:27 AM

There is a battery in there.  maybe it's dead?



#4 JohnC_21

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Posted 25 April 2016 - 07:10 AM

Along with changing the battery if bad, tap F12 at boot and see if you can select your DVD drive as boot device.


Edited by JohnC_21, 25 April 2016 - 07:11 AM.


#5 DavisMcCarn

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Posted 25 April 2016 - 03:10 PM

F12 is the standard key to display the Dell boot menu.


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#6 sniper8752

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Posted 25 April 2016 - 05:26 PM

F12 brings this boot device menu up:

* System Setup

* Hard Drive Diagnostics

* Boot to Utility Partition



#7 DavisMcCarn

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Posted 25 April 2016 - 05:35 PM

For whatever reason, your Precision 490 does not think there is a CD/DVD drive in the PC. Have you checked the cables inside the PC?  There should be two to the CD/DVD drive.


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#8 sniper8752

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Posted 25 April 2016 - 06:56 PM

yes, there are two.  i can open/close the dvd, and i removed/put back in the ide ribbon cable on both ends.



#9 DavisMcCarn

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Posted 25 April 2016 - 07:42 PM

Back into the BIOS, you need to set the SATA Operation mode to combination or it won't use the IDE/PATA controller!
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#10 sniper8752

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Posted 26 April 2016 - 04:53 PM

So I tried removing the bios battery, and then putting it back in, now it is saying "alert!  incompatible processor detected".  I can't currently get to the bios setup.



#11 JohnC_21

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Posted 26 April 2016 - 05:22 PM

This seems to be a Dell specific error. I would try clearing the CMOS settings using the jumper as shown in your manual on page 21.  I would replace the CMOS battery if possible.

 

Your computer is supposed to have a set of diagnostic lights on the front. See page 141.



#12 DavisMcCarn

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Posted 26 April 2016 - 07:02 PM

Did you change the processor?


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#13 sniper8752

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Posted 26 April 2016 - 07:16 PM

1,2,3, is lit.  I looked it up.  It doesn't help.  


Did you change the processor?

no.



#14 JohnC_21

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Posted 26 April 2016 - 07:25 PM

Does it say to press F1 after you get the processor error?



#15 DavisMcCarn

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Posted 27 April 2016 - 07:54 AM

No, I'll bet it says "system halted"
And, according to several threads, its because you upgraded the BIOS at some point.
What is the SERVICE TAG number? (That will let me see exactly what you're dealing with)
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