MAC G4 to PC conversion project (Part 3 – Case preparation 2)

Custom PC

PC motherboard fixings: Custom PC

MAC - PC Motherboard installation
MAC - PC Motherboard installation

One of the things we believe in is re-using old components so whenever we dismantle an old machine we tend to keep the bits so a quick look in the parts bin gave us a chassis for mounting a mATX board. This saved us from having to drill new fixings for mounting posts for a motherboard all we had to do was drill 2 fixings for the chassis itself. The other benefit was that we could manoeuvre the chassis within the case before drilling the fixings to make sure we had enough clearance to be able to close the case without anything hitting against say the power supply or optical drive. (Sounds good but we nearly came to grief at the last hurdle – see later on for details). Another thing this allowed us to do was to do a preliminary installation of the motherboard cpu and memory etc. (we actually fired the computer up before assembly to prove the hardware before installation.

If you are unlucky enough to have a separate chassis for your motherboard then you’ll have to trial fit your motherboard and then mark out fixing points using the holes in the motherboard as a guide. What I would do though is make a cardboard template and use this to mark out your drilling points for the fixing posts. I’d use those small brass fixing posts but the plastic push fit type are probably easier to fix.

Orientating the board: Custom PC

MAC - PC PCI card retaining strip
MAC - PC PCI card retaining strip

Using the chassis it was easy to trial fit the motherboard and assembly in position before final fixing. We installed temporary PCI and Graphics cards to line up the rear panel fixings (This is important – allow space for when the plastic goes back or your connectors will foul). We ended up cutting away the join between the two sections of the rear panel to clear the Audio connectors but some motherboards may not need this.

Card fixings: Custom PC

Thanks again to the chassis we only needed the top rail from the old I/O panel to be able screw the top of the cards to the rear panel the chassis provide the bottom fixings for the cards. The top rail was hack sawed from the rear panel and fixed back onto the case using self tappers. We actually did this at the same time as orientating the board so that the cards lined up perfectly. If you are not lucky enough to have a chassis then you will need the bottom fixing points as well so just hacksaw down the middle of the I/O panel and fix once again with self tappers.

Optical Drive caddy: Custom PC

MAC - PC Optical Drive Caddy
MAC - PC Optical Drive Caddy

At the last hurdle just as we thought we were home and dry on closing the case the ATX power connector was found to catch on the drive caddy. Fortunately it was not catching on the drive itself so with the application of the hacksaw again, 1.5cms was removed from one corner of the caddy. Unfortunately this was still not enough because we found that the retainer for the ATX cable itself was catching on the back of the optical drive – the only solution was to cut this off using a knife. It was a tight fit but the panel closes.

Part 4 looks at the assembly, cable choices

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