How can I reset the bios password on my Sony Vaio laptop model PCG-GR370?

Well I have a Sony Vaio laptop model PCG-GR370 that I bought about 2yrs. ago and about a month ago it crashed on me and started asking me for the bios password.I dont know the password and the person who sold it to me does not know it either.So I know a little bit of electronics and I opened the laptop to drain the CMOS battery(and yes everything was unplugged) but that didn't work and I've tried several passwords that I found online but they didn't work either.So I ask you guys what else can I do to over come this problem?Is there jumpers on this laptop?Cause if there is I can't find them.Or is there another battery or some type of bios reset button?