A quick search, turns up a reference here.
http://www.fixya.com/support/t308478-booting_problem
"When PBR.....2 hangs, the comp can't find the MBR(master boot record)
the PBR=Partition Boot Record. Its something that is loaded before
windows but after BIOS."
Now, if that is true, it may be possible to repair it.
http://www.goodells.net/dellrestore/
http://www.goodells.net/dellrestore/hpa-issues.htm ("PBR2" mentioned here.)
http://www.goodells.net/dellrestore/manualrestore/ (fun with partitions...)
So there is information available, that explains what lurks
underneath a Dell. It would appear a Dell is a bit of
a specialty item.
Your first priority is ensuring your user data is backed up,
and either using a USB enclosure/adapter to hold the laptop drive
temporarily, or connecting the drive via an appropriate
adapter to an internal desktop drive interface, should allow
you to copy user data and email database etc.
Example of an adapter, for connecting a hard drive, via
USB2 interface, to another computer. This one apparently
covers SATA and older IDE style drives.
http://www.newegg.com/Product/Product.aspx?Item=N82E16812156017
Example of an adapter, for connecting a 44 pin 2.5" laptop IDE
drive, to the 40 pin ribbon cable interface on the inside of a
desktop computer. The pin pitch on the 44 pin and 40 pin sections
is different, which is where the adapter helps.
http://www.newegg.com/Product/Product.aspx?Item=N82E16812203012
Paul