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Need to bypass bios primary or admin password for authentication system

We work in a school where we purchased laptops slightly used from another company.  Because the laptops aren't registered to us, Dell will not give us the bios/primary admin password.  Is there any kind of work around for this?  The computer won't go on at all.  It boots up and then we are stuck on the Dell login screen.   Any help would be greatly appreciated.  Our techs are stumped.  
1 Solution
The only way is to reset the motherboard it's self. Shouldn't cause you a problem as it's likely to be the default setup anyway.
There's two ways to do this, on the motherboard there's a 'Clear CMOS' jumper which you can set OR simply remove the battery you'll see on the motherboard, remove power to the PC and wait 10 mins.
After that replace the battery/jumper switch the machine on and the BIOS will be back to default settings which will wipe the password.
That method  is usually only found on desktops, not laptops. Security chips in laptops today are not as easy to circumvent. There really is no  way other than to have the security chips replaced which is not cost effective in your case, as they need to be desoldered from the motherboard.
The best way would be to fill out a transfer of ownership from dell on the systems, once that has gone through(it says it can take 5 days but usually takes 24hrs or less) contact dell and they will provide the master password(s) for the systems. The only other ways are replacing the security chip as sparkmaker suggested or replacing the the motherboard. Stashio suggestion will not work, removing the cmos battery will do nothing to the bios password. Here's a link to the transfer of ownership form you can do several systems at a time.

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