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Z420 at start up , I see no HP logo, just black screen, this after I changed boot sequence.

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I wanted to boot from a DVD to upgrade the OS.  I went into the Bios, Attempted to change the boot sequence

so that the boot would be off the DVD.   

At boot time , I useally see the HP logo, with a message to hit escape or f10, and then windows comes up.

 

Now I see no logo, nothing but black screen. 

After about a minute or two, all the fans in the workstation come on strong and make lots ot noise.

Thei OS  does  not boot, system is "Dead" ? 

 

I tried to clear the CMOS by disconnecting everything and pressing the Yellow button on the mother board , 

No change.

 

How to I get back to the default configuration ?????

Thanks in advance for any help.

Joe


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