my laptop is Compaq Presario CQ45-108AU, AMD processor, 2g RAM, 360g HD.. bought in Jan 2009, but now having same problem with you..
when i switch on the power button, only the white led blinking for a long time. It never display anything on the screen..
I've test to replace RAM and Harddisk, also i do the hard reset.... but still no response at the display.. only led blinking and fan sound.. huhu.. is it motherboard problem???