In the BIOS, do the following steps.
1) Select Fail-Safe settings
2) Check processor and FSB settings
3) Do not set memory to aggressive timings
4) Set IRQ to BIOS or similar setting.
5) If there is no OS and valuable data on the hard drive, set hard drive geometry to LBA mode.
6) Make sure USB, video and other hardware gets their own IRQ.
If nothing works, disconnect the computer from the AC outlet and move the jumper to discharge the CMOS. Then put the jumper in the normal position and connect the computer back to the AC outlet. Repeat the above steps.
Again if you tried the second time and it still fails, you may need to update the BIOS by flashing it. Flashing the BIOS is risky, so you may want have someone do it or buy the BIOS chip from the motherboard manufacture.
Though the fix could be as easy as setting up the boot loader which you may have skipped. I think Debian uses LILO. I prefer GRUB because it is a lot easier and provides added features such as a shell to ease boot up with out a config file or browsing through text files from a desire partition..