[G4] power supply upgrade

[Robert MacLeay]

I don't believe it.

I can speak only from personal experience, but suspect that your previous
upgrade is to blame.  Many upgrades to the early G3/G4 Macs required custom
firmware upgrades for installation.  I have one such.  If your 800 MHz
upgrade was one of them, the incompatibility lies with the 800's firmware
being incompatible with the  1.5 GHz; your Mac is an innocent bystander.

*If* this is the case, your simplest route is to sell off your current G4
and purchase another one --the early G4s are selling under $100 on eBay--
and upgrade it.  Alternatively, you would need an Apple firmware upgrade to
reinstall to return your Mac to its pristine state.  Oh, yeah -- you will
need to reinstall the original Apple CPU first.  All using OS 9.

On Sun, 12 Nov 2006 20:07:37 -0500, Charles Robles <crobles1 at nyc.rr.com>
wrote:
> I recently purchased a mercury extreme 1.5 GHz processor upgrade for my
> g4 originally 400MHz machine. I also previously installed an extra
> hard drive and ati 9000 pro video card. The previous processor
> upgrade was 800Mhz. Well, the new processor did not work- no startup
> chime and no picture so i put back the old processor and everything
> works fine. I received a replacement and got the same results so i
> spoke to a tech guy where I bought it and he suggested that I am
> probably right over the line powerwise. I suspect that he might be
> right. He suggested I can get more power by buying a pc power supply
> and just splice some wires and such to install it. I don't know the
> details yet. I guess my question is do you think the tech guy is
> correct as I suspect he is and what kind of pc alien part should fit
> into the space and how big volt wise would be too much for my g4 or
> should I just forget the whole thing?