Please help...I am at my wits end with this machine. It was brought to me a week ago; it would not boot up or send a signal/show display. I have replaced the motherboard (Acer G45T/G43TAM3 v1.1) and the cpu (Intel Pentium Dual Core E5300 LGA775 CPU). Now I can hear it trying to boot up, but it never gets to POST or shows any display. I have the same outcome if I try without any RAM. Any ideas are greatly appreciated...