Can't p7p55d boot without memory card?

my board is P7P55D with nvidia geforce 9500m GS 1Go(which I have been using on other build for a while),intel i5 650, PSU advance-480w without ram.After powering the system
for the first time, a short beep was heard, again 2 or ..beeps followed and a continues beeps; whilst the keyboard lit for a second and stoped working likewise, there were no message on monitor which means it's also not working.Why?
I thought,I could atleast boot from the bios; is it really because there was no ram?
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More about p7p55d boot memory card
  1. you must have RAM, and you must install an operating system before booting.
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