Problem in DNA extraction.

I am following filter paper method for Blood DNA extraction. Here is the protocol. ( blood spots (100 ul) on filter paper were soaked in 200ul of TE buffer (10mM tris, 1 m M EDTA) and than incubated at 50 celcius for 15 mins followed by incubation at 97 celcius for 15 min).
Problem is that i did not get n e bands of DNA on gel but got very good OD at 260 nm. according to OD, yield was approx 4 ug/10ul.
Can anybody help?