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Jul - Computers and Technology - Rebuilding a G4 New poll - New thread - New reply
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drjayphd
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Posted on 10-01-07 04:11:17 AM; last edit by drjayphd on 10-01-07 04:41 PM Link | Quote
Now that I've had time to sit down and deal with the various parts (upgraded the CD-RW to a DVD-RW, added a 60 GB hard drive), I have what could be a very functional PowerMac G4. It appears to be the AGP graphics version, no gigabit Ethernet. HOWEVER, I don't know what else is going on because...

When I try to turn it on, nothing. The power light on the computer will turn on when I hit the switch, then fade out when I let go. I hear something sort of spinning up as well, but it doesn't turn on. It doesn't even get far enough along to do anything else. What could be wrong with this? Power supply? Logic board? I snagged this from a thrift store, so I couldn't test it there.

EDIT: Well, it didn't help that the RAM was seated backwards. Technically, not seated, seeing as one end didn't go in. Hmm, could be because of the plastic thingy in the slot that's supposed to go in the notch on the other side. Fixed it, took out the non-matching RAM (if it matters, one stick was PC-100, the other was PC-133)... nothin'. Same issue. The red LED on the logic board turns on when I hit the power switch, as does the case fan, but those go too. So, logic board yes?
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Posted on 10-01-07 05:11:11 AM Link | Quote
JL2 - Post #1185 - 10-01-07 12:11:11 AM
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Does it stay on if you hold the button? I'd be examining the power switch and supply.

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drjayphd
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Posted on 10-01-07 04:41:13 PM Link | Quote
Well, if I hold it down long enough, it just shuts off (probably so nothing happens if the switch is stuck). It doesn't boot up at all, though.
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Posted on 10-01-07 06:15:45 PM; last edit by Komachi Onozuka on 10-01-07 06:21 PM Link | Quote
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Well, your RAM has incompatible PC ratings on them, for starters. It's not a good idea to boot a system with a PC-100 and PC-133 in the slots COMBINED. You should have similar ratings to begin with, so you may have to do some digging for a 133.

Otherwise, it might be a fault with the motherboard...possible short...maybe near where the board is connected for the (9 or 10 pin) spot where the power/led/hard drive activity is located. You can actually jump said path with a screwdriver by touching between the two pins that provide switch on/off, provided that it has power to the board initially. If it doesn't jump, then something's probably miffed in the mobo. If it boots then the switch is probably screwed. I would think power supply secondly.

One thing I've been suggested from people here is to take out all unnecessary peripherals and PCI cards and see if it boots up without any problems and stay on. Disconnected everything but video, basically. If it powers up, then you can guess it's the power supply. Also, try one stick of RAM at a time over the other; slot closest to the processor. If either stick of RAM is bad, it could help in making it go defunct.

I'd get the RAM replaced though afterwards. I THINK I saw 133 at an Office Depot a few months ago; 133 is hard to find these days.

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Jul - Computers and Technology - Rebuilding a G4 New poll - New thread - New reply


Rusted Logic

Acmlmboard - commit 47be4dc [2021-08-23]
©2000-2022 Acmlm, Xkeeper, Kaito Sinclaire, et al.

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