Mac g5 tower blinking light

I don't know much about Power Macs but it looks like my boss's G5. So does anyone know what it means when the small white power light in the front is blinking? Originally Posted by amagab. Thanks for your replies. The fan does come one but I'm in a noisy room so I can't tell it it's full blast. I guess I'll open the darn thing and check out the RAM. I also read somewhere else to reset the PRAM. Thanks again! I'll get back later with updates. Hold it till you get at least 2 startup chimes. I tried resetting the PRAM with the key combination but no response and no chimes.

I replaced the RAM and now the blinking changed. Now it blinks three times every few seconds. Fan is still high speed. I still cant reset the PRAM.

So does anyone know what the three blinks sequence mean? I also want to add that there is a red light on inside close to the RAM slots.

How to fix PowerMac G5 "No Display" and power button blinks 3 times (100% WORKING!!!)

Will search for it again, but there was one with blinks and it was the Power Supply. Will find it and post it for you. Search this page and see if anything fits. If so, bad power supply http: Thanks for taking your time trying to help me with this.

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Okay, I found a very helpful article about the lights: The three blinks indicate I inserted incompatible RAM. I have to investigate further after I buy the correct RAM.

I'll update this thread asap. I'll be back! I had the same single blinking white light, then it would stay still for a while, then blink again once every few seconds or so. You might try reseating the RAM. Gabriela asked "Why my Power Mac G5 doesn't start working? Also a white light near the power button blinks in 3 times continuously. The same error continued, and my suspicions were confirmed It turned out to be the memory controller on the motherboard. Obviously, my G5 was way, way past my AppleCare expiration.

Knowing it would cost a good deal to get the memory controller replaced, I opted to put that money towards a new MacPro instead. My G5 had served me a good, long time, but for me it was time to move on. It could also be a bad memory socket. My G5 died when I reseated my memory because they were far to tight. It must have cracked the solder. On the G5 there are eight slots four matched pairs of slots.

Just remember to keep the RAM modules in a pair of matched slots. Had this happen with my G5 as well. I hope the Mac Pros are a little more resilient in this area given the premium we all pay!

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Gabriela asks: Like the others listed here, I had this happen to my G5 about 8 months ago. It's toast. Technically, I supposed it could be repaired, but it's cheaper to buy a new Mac and you'll get a more capable machine. Pull your drives they can be put in all the Mac Pros, or an external case if you buy a different Mac , buy a new machine, and make sure you have Apple recycle the G5.

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Don't blame Apple or its suppliers I've worked in electronics manufacturing industry for decades as an engineer and I've organized various electronics manufacturing technical conferences as technical chairman. I'm certain that Apple uses premium components from the best manufacturers. Apple also uses the same top tier contract manufacturers as other major brands of PCs, smart phones and other consumer products. The biggest reliability issue in electronics today is the lead-free solder that manufacturers are forced to use by an EU European Union ruling.


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Lead-free solder makes the critical electrical connections between boards and components that provide power and logic connections. During manufacturing to assemble the final electronic product, the solder must be heated to melt the solder metallic alloy to make intermetallic connections.

A few years ago, the EU European Union banned electronic product sales in the EU if the product contained solder containing lead. Their stated concern was that end-of-life disposal of electronic products containing lead might leach lead into the environment.

Power light blinks twice, fans high

In the real world, there is absolutely no documented case of the ultra reliable eutectic tin-lead solder leaching into the environment. That forced all manufacturers to use lead-free solder that has inherent reliability problems. Most of the newer solders are primarily tin with traces of one or more other metals used to make the solder alloy. Tin is problematic in electronic products. The failure rates are high for many products regardless of cost. It was an ill-advised EU decision that is being protested by electronics manufacturers worldwide.

One problem is that lead-free solder requires a much higher melting point to make a connection than older tin-lead eutectic solders that are proven to be reliable and safe. The higher lead-free solder melting points frequently damage integrated circuits ICs and other parts. Apple's and other PC maker's problems are directly related to the solder encountering normal temperature cycles from simply turning the power on and off.

Lead-free solder has poor mechanical strength so bumping or dropping a product could make solder joints fail and produce an open in the circuit. Lead-free solder reliability is so poor that the EU has exempted telecommunications, computer servers, medical devices and some military electronics from the rulings, since these products must work. The electronics industry is very unhappy with lead-free solder but EU legislators are the problem. I can assure you that the soldering problems are not unique to Apple -- it is a frightening global problem.

If you want some specifics, check out the following on lead-free solder problems items below. Tin is known to produce "tin whiskers" spontaneous dendritic growths that cause electrical shorts if there is humidity in the area where equipment operates. Not exactly desirable.

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This is one reason the military avoids high tin content lead-free solders. Cadillac, at about the same time, had an engine computer that would accelerate, change engine power levels abruptly or stop the engine, much to the driver's chagrin.

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It cost GM millions to recall and replace the faulty circuits. Recently, the USA lost a multibillion dollar reconnaissance satellite recently because of lead-free solder failure problems so it is not just a computer problem. You can read Lead-free solder: A train wreck in the making from Military and Aerospace Electronics magazine. Draw your own conclusions. The Folly of RoHS addresses lead-free solder problems.