I currently have an Acer Aspire T310 with a P4 2.8 and I am trying to upgrade the CPU to a p4 3.4 prescott. My PC works fine with the 2.8. When i put the 3.4 in I find that it is really difficult to get it to boot at all. My monitor is blank - there are no errors. I have upgraded the PSU to 480W and I have got a better heat sink/fan. Plus I have updated the bios. I know the CPU works, because on odd occasion it has actually booted up?! I have looked at the capacitors near the CPU and they look in good nick. Any help will be greatly appreciated.