Dear, i have DELL studio PP39L and having bios problem, system hanged on bios loading. if any one can help me i will be very thankful.

Cpu, Memory, HDD, hardware issue,Take a look at this Dell forum: http://en.community.dell.com/support-forums/laptop/f/3518/t/19436289.aspx

Magnet?

Do a system recovery.

Check the AHCI setting in the Bios or System Setup and make sure it says SATA or Large Drive Support.

If it is on SATA change it and see what happens.

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Press the Fn key while powering on the system, this will launch the PSA diagnostics. See if you get any hardware errors (I suspect you may have a failing hard drive)

basic troubleshooting steps include the following:
Ensure that the BIOS, the Notebook System Software and the Video/Audio drivers are all most current available.
All can be downloaded here:
http://support.dell.com/support/downloads/driverslist.aspx?c=us&cs=19&l=en&s=dhs&os=WW1&osl=en&SystemID=STUDIO1558&catid=-1&impid=-1
If issues persist, run diagnostics, see if a hardware failure is detected (Power button while holding Fn button should initiated diags)
If that still doesn't help, you can try the system with the RAM modules individually (Often a crash issue is isolated to one RAM module or the other, regardless of DIAGS results)
if issues still persist and no hardware has been IDd as a problem, then run Malwarebytes from download.cnet.com

It may be an issue with your harddrive

you can find the eject button immediate right to the F12 KEY.(THIS IS FOR DELL PP39L LAPTOP)

IFit helped u say thanks..