I bought one MDD G4, found I needed a second one, bought the second
one a couple or three months later. Thereafter I used them both, side
by side, rather heavily. So both received virtually the same use and
they are almost the same age.
I put in new battery backups to address the possibilities you raised.
Some have suggested that the 400 W power supply was brought out as a
quieter system to address G4 noise complaints?
I am considering scrapping these G4's because used power supplies on
eBay are costing close to $150.00 with shipping. These power supplies
have a poor service record and a used one is a risky investment. I
presume that new ones are going to cost more than the G4's are worth?
National Ram Electronics will repair G4 power supplies for $90.00
each and that seems to be the minimum cost to put the G4's back in
service.
===============
On Oct 7, 2010, at 2:11 PM, Dan wrote:
At 1:22 PM -0400 10/7/2010, James Morgan wrote:
I have a pair of Dual 1.25 MHz MDD G4's which have been my
graphics workhorses since I bought them new. Recently the power
supplies failed on them both within a few days of each other.
Were the Macs purchased and put into service at the same time too?
Two supplies gaking together is very strange - look upstream in
your power chain for a blown surge protector, floating ground,
etc. Don't just ignore this problem; other devices could be at risk!
I removed the power supplies and was surprised to find that the
power supply in the first computer I bought is an AcBel 400 Watt
Rev B and the power supply in the second one I bought a few months
later is an AcBel 360 Watt Rev A.
Does anyone know why Apple used two different power supplies in
two virtually identical G4's? Or which one is the better power
supply? Did they have problems with the 360 W and replace it with
the equally undependable 400 W?
Apple didn't do anything other than give the contractor the specs
from which to build the machine. That contractor probably ran out
of the one supply and substituted another. Or perhaps the one with
the bigger supply was built with video or extra HDs that required
it? Could be many reasons. Either way, 40W is no big deal.
There is an online service, National Ram Electronics, that repairs
the AcBel G4 power supplies. Does anyone know if these bits of
Chinese junk are worth repairing?
Unless the repair is very simple and inexpensive, I'd just replace
'em.
FWIW,
- Dan.
--
- Psychoceramic Emeritus; South Jersey, USA, Earth.
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those using G3, G4, and G5 desktop Macs - with a particular focus on Power Macs.
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