dude, better have a CD for your OS. you need to reinstall OS manually on this option, I think that is common on desktop computers of Dell.  anyway, that can still be fix by a MANUAL OS reinstallation.

After 7 months investigation I have stumbled upon the answer! The DellRestore and DellUtility partitions boot into Dell's version of DOS that they call DRMK for "Dell Real Mode Kernel". I could not find any useful information about DRMK anywhere, but when I had problems with Dell MediaDirect, I used the Dell MediaDirect Repair CD. And guess what this CD booted with? DRMK!

But to get DRMK back into the bootsector you need sys.com for DRMK. And there it is on the Dell MediaDirect Repair CD!

 

So, repairing "CTRL-F11" and "Loading PBR for descriptor...Done" errors is easy! Very easy!

1. Download DSRFix: http://www.goodells.net/dellrestore/files/dsrfix.zip

2. Download Dell MediaDirect Repair CD: ftp://ftp.us.dell.com/app/R121517.EXE

3. Run the file "R121517.EXE" and burn the ISO to a disc.

4. Copy dsrfix.com and ptedit.exe from dsrfix.zip to the repair CD.

5. Boot with the CD.

 

You need to sys.com either the DellRestore or the DellUtility partitions so you need to know the drive's correct letter, don't sys.com the Windows partition! You could type

"dir X: /p" (X=any drive letter) and check the lable for DellRestore or DellUtility. Or you could use ptedit and set the partition you want to fix to C: by changing 00 to 80 and rebooting to CD, now C: is whatever you changed to 80 with ptedit. For example: ptedit, change partition 3 to 80 (also change what was 80 to 00 because only one can be 80), reboot to CD, type "A:\sys C:" now type "dsrfix /f" That's it! If you copied dsrfix.com and ptedit to the disc they should be at F: and sys.com should be at A:

 

Basic command:

 

A:\sys X:

 

Where X: is the drive letter of the partition to fix.

 

I hope you are as happy as I am now. Good luck!

I must clarify my earlier post above regarding dsrfix.com and ptedit.exe. I just assumed copying them to the Repair CD would make sense, but when I burned them to my Repair CD and booted it they were nowhere to be found. I've been trying to figure out why. If anyone knows please post here.

 

PS: I had no CTRL-F11 blue bar and fixed that with Dan Goodell's dsrfix program (thankyou, Dan!). But that only enabled switching the boot partition to the DellRestore partition which gave me the "Loading PBR for descriptor 3 ... done" and hangs error. I fixed that with the MediaDirect Repair CD and its sys.com. Now everything works like new!