HP Pavilion a4316f-b, when turned on freezes at the HP splash screen. Pressing any of the function keys doesn't do anything. I tried swapping RAM (3 x 2 GB) and no changes. If all RAM is pulled out the MB beeps like it is supposed to if no RAM is present. I unplugged the hard drive and then it will go past the HP splash screen and tell me no bootable media is found. I have tried 3 additional hard drives, all with the same results, if they are plugged in, the computer freezes at the HP splash screen. I even tried a different SATA cable from the motherboard to hard drive and tried different SATA ports on the motherboard. Since it is the same results for a total of 4 hard drives, I'm guessing it is an issue with the motherboard or is there something else I should be checking? Any help is appreciated.