what do you mean you cannot enter the bios?
also, that message means your drive/s dont have a proper boot OS, you will probably have to reinstall, unless the HDD is dead, which lets hope it's not because then it becomes messy
I think you have the two best answers already, make certain nothing is plugged in to any port and there is no disk in the DVD drive. What happened to cause it to behave like this? Have you made any BIOS changes? Any hardware changes? Any other changes?
If this is a PCS laptop I would give them a call as soon as you can.