I have accidentelly crached my motherboard

I have accidentelly execute a dos program (it is a flash program for dos)
it asked me for a file, but I have click OK without giving him any filename
So, it told me an error message, and the PC was bloqued, then i have reboot it
But the PC dont want to Boot. I got only a long series of beeps and no other things.
it's: two long beep, and a continue series of beeps
ex: beeeeeep, beeeeeeep, beep,beep,beep,beep,...etc
Can someone help me? Your help is hardly needed
Thanks
lotfi