|Are you in the bench testing phase or did you slap everything inside the case without testing it 1st? You left out a LOT of important info.....|
"I bought used hp motherboard" - model number?
"and I install Intel cpu D" - model number? Are you sure it's supported? What type of thermal paste did you use & how did you apply it? The "horizontal line method" should be used for a Pentium D.
"and power up" - what's the power supply make/model/wattage?
"the cpu fan turn on automatically" - stock Intel HSF or aftermarket?
EDIT: Fingers beat me to it!
message edited by riider