DMI or Desktop Management Interface is a layer between system components and the software that manages them. The System Management BIOS is an extension of the Basic Input Output System (BIOS) that formulates and delivers this information to the operating system. The pool data is the information. In short, when the BIOS is "Verifying DMI pool data" it is verifying the table of data it sends to the operating system (Windows, etc.). If it isn't sucessful, it should return an error. Wait a reasonable period of time for it to finish. It may make take some time or it may be stuck.
1 - what about DEL or f2... (common bios entering keys) get into the bios try and enable a feature called enable "Reset Configuration Data" (may be "Force Update ESCD" in some CMOS Setuups) in the motherboard CMOS Setup PNP/PCI configuration. (Rebooting will automatically disable it after it has done its thing.)
2 - the CMOS my have gotten corrupted, clear it.
3 - some piece of hardware has come loose, be sure everything is plugged in, in fact.... if it's plugged in - unplug it and plug it back in again.