Ok, decided to disassemble this labptop and find out what was going on. and there is in deed a 2nd ram chip that is located under the keyboard. after many attempts of cleaning and reseating it, finallly got the computer to come up. using both the ram chips. so I answered my own question above as there are 2 1gb ram chips on a inspiron 1521. Hope this helps someone else wth the problem of blinking caps (45 times).
Oh I had no problem booting up the computer leaving that ram out under the keyboard. Must have been real dirty as I used tuner wash to clean it out.