Reseat the CPU and try the upgraded CPU and check if the heat sink is securely mounted.
Sent from my iPhone On May 14, 2012, at 6:58 AM, Valter Prahlad <valter.prah...@fastwebnet.it> wrote: > Having acquired a G5, I'm in the process of selling my old PowerMac G4 DA. > It has an upgrade CPU (OWC Mercury 1,4 GHz), that I'm selling on its own. > > Today I took out the upgrade CPU, and I put back in the old, original Apple > 667 MHz CPU (I applied thermal grease, connected the CPU fan wire, pressed > the PMU switch). > > Problem is, the Mac doesn't boot anymore. > When I press the power button, it doesn't make any sound at all (no boing, > no beep), and the screen stays black. Fans are running, the power button is > lit, and that's it. > The HD doesn't seem to be accessed (no whirring from the drive's heads). > > One week ago, I used this Mac (with the upgrade CPU still in), and it had no > problem -- You received this message because you are a member of G-Group, a group for those using G3, G4, and G5 desktop Macs - with a particular focus on Power Macs. The list FAQ is at http://lowendmac.com/lists/g-list.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to g3-5-list@googlegroups.com For more options, visit this group at http://groups.google.com/group/g3-5-list
