did you forget to clip the cpu into the cpu socket? I know my friend did that once... and we had to take off the cpu cooler and and *** to get to the cpu...
Your motherboard doesn't support the processor.
HP website said it supports the following.http://h10025.www1.hp.com/ewfrf/wc/document?cc=us&dlc=en&docname=c01925562&lc=en&product=4120567#N92
Supports the following processors:
AMD Phenom II X4 9xx/9xxe/8xx Quad-Core (Deneb)
AMD Phenom II X3 7xx/7xxe Triple-Core (Heka)
AMD Phenom II X2 5xx (Callisto)
AMD Athlon II X4 6xx/6xxe (Propus)
AMD Athlon II X3 4xx/4xxe (Rana)
AMD Athlon II X2 2xx/2xxe (Regor)
No Thuban based X6.