Dell M5010

Hi guys, I've searched Internet and didn't find the answer. I have Dell M5010.
When I try to start it I've got a problem.
There's a logo of Dell and then I need to enter system password.
After 3 attempts Service Tag shows up and PPID.
Is there anyway to unlock system? I've tried taking off battery but it didn't help.
Service Tag: 9K0TDL1
PPID: CN0WTVYR70166069007WA00

Sorry for my english, I'm not very good, but I hope you'll understand and maybe you can help me.
Thanks.
 
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