[JamesKass]

Having a problem that I fear might be power supply related, but wanted to get your opinion first.

Here's my setup:
G4 Dual 1.25 Mirror Door
1.25 gig Ram
Factory 80GB Hard Drive
Factory SuperDrive
Installed 2nd DVD Burner in lower optical bay.
Tempo Trio ATA/Firewire/USB Card
200 GB Maxtor ATA/133 connected to the Trio, installed in the bay below the opticals.

I'm trying to install a new 300 GB Maxtor drive in the second slot below the opticals. I connect it, setting the 200 as the slave, the 300 as the master, with the jumpers positioned correctly, the power connector hooked up, the ATA/133 cable correctly hooked up to both the drives and to the trio card.

I close everything up, hit the power button, it glows for two seconds then nothing. No start-up chime, no nothing.

When I discconnect the new drive from the power connector, the computer starts up again as normal. Is there something I'm doing wrong? I would've thought that with four bays for HD's and two for Optical drives, the power supply would be sufficient to run everything. Though I could be wrong.

Any thoughts? Clues? Suggestions?

Thanks! --

[Kenneth]

How about try resetting the PMU on the logic board. According to Apple;

Many system problems can be resolved by resetting the PMU chip. When you have a computer that fails to power up, follow this procedure before replacing any modules:

1. Disconnect the power cord and check the battery in the battery holder. The battery should read 3.3 to 3.7 volts. If the battery is bad, replace it, wait ten seconds, and then proceed to step 2. If the battery is good, go directly to step 2.

2. Press the PMU reset button once and then proceed to step 3. Do not press the PMU reset button a second time because it could crash the PMU chip.

3. Wait ten seconds before connecting the power cord and powering on the computer.

The PMU button is located near the ATA/66 connector.

[JamesKass]

Didn't work. However, when I swapped the drives so the 300 was the slave and the 200 was the master, it all of the sudden worked.

In the words of Billy Joel, "Don't Ask Me Why..."

Thanks for the advice, though!

[IFLY2HIGH]

I had a similar problem as well. I found that I had plugged the end connector into the slave drive, (end connector goes to master), and then the one in the middle of the cable up to the master drive, (middle connector goes to slave), and it got confused, but in my case it wouldn't show either of the drives. Really anymore Cable Select is the way to go, never have to worry about any jumper settings again, and I think most if not all Hd's today come as CS from the factory.

[bighead]

For one thing, you don't really need to connect those drives to the Tempo card. MDDs will recognize all of the space on the drives, and they'll likely not react to the speed difference between ATA66 and ATA100.

Second, all hard disks on the MDD and QS2002 Edu models (and I believe all of the optical drives as well) _need_ to be set to cable select. I can double check this, but I don't believe the machine will boot properly with the drives set to master/slave.

[kiazer]

I have a MDD --- On the man ATA 100 channel I have 2 120 gig drives - One set to master and one set to slave. ( the master goes on the end of the ATA cable ) - I also have a 20 gig on ATA 66 bus and thats set to cable select.


Hope that helps

[JamesKass]

The drives are both ATA 133. Is there really no speed or performance difference if I hook it up to the ATA 100 cable, as opposed to through the ATA 133 on the Tempo Card?

[bighead]

Originally posted by JamesKass:
The drives are both ATA 133. Is there really no speed or performance difference if I hook it up to the ATA 100 cable, as opposed to through the ATA 133 on the Tempo Card?

The drives themselves can't really push over 100MBps, so the added bus speed doesn't do much. Most drives can't do over 66MBps.

Evidence: I have (2) 200 GB WD2000JB drives in an OS X soft RAID. I'll be upgrading to a hardware RAID card when I get larger drives. According to this page on Tom's Hardware Guide, the WD2000JB sustained writes at 32.3MB (low)/56.4MB (high) and sustained reads at 10.8MB (low)/56.1MB (high). The burst rates were over 80MB for some drives, but about 66MB for the WD2000JB. The ATA133 card wouldn't really make a speed difference, but a hard RAID card would.

Search Tom's for more benchmarks on SATA drives.