I have a g5 power mac 2.5 dual cpu with the water cooling . This started to leak, and found that one of the lugs on the water block had cracked. I cannot find any where to get a replacment ,Any ideas please.
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Re: water block lug cracked
There are specialist Mac repairers that can supply parts on the net. You should be able to find one reasonably local to you who will be able to supply you with a replacement as these items can't be reliably repaired.
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Try using the browser Google Chrome, it has flash built in and it is a bit faster. If this doesn't work, you'll have to kill some programs to get more processing power. Press and hold the command key, and then tap tab while still holding command to cycle through your running programs. Let go to stop on one you kill, and then press Command + q to kill it. Do this with as many programs as you can to get better performance, you can always start them up again later. If none of this works, you may need to upgrade your graphics card...sorry.
None of the parts are usable in any other machine.
The coolant from a liquid-cooled G5 PowerMac is toxic. If your G5 is leaking, disconnect the power cord IMMEDIATELY. Flush any skin exposed to the fluid with water for at least 15 minutes.
If you want to glove up and extract your hard drive from the machine so as to save your data, do it carefully. Other than that, my recommendation is to bag up the unit and handle it responsibly as toxic waste, using the same guidelines your area uses for antifreeze.
Is this a liquid cooled G5? What CPU is it? Need as much info as possible like what where you doing last time it turned on? Have you looked inside the case? Do you hear any clicking when the power cable is connected for the first time? A lot of the last G5's were liquid cooled and a lot have leaked in the past. This small leak eventually ruins the power supply and worse yet ruins the logicboard and CPUs. If you don't know if it is liquid cooled look for a warning stamp on the bottom near front by the CPU fans (inside the case). It states to shut off if liquid is viable (something to that effect). Most times the liquid cannot be seen as it drips into the power supply on the very bottom. I would take it to Apple and have them check it out.
Just to clarify a G5 is not a Pro or "desktop Pro" (Mac Pro is an Intel based machine). Yours is a "Power Mac". Install a temp monitoring app to see the temperature (mainly the CPU temps). Mine runs around 50 to 60 Celsius and never more than 72. If the temps run to high she will shut down. G5 are great machines but it's not rare for them to go bad. Power supply issues and liquid coolant leaks are well know. Fans controllers have stopped working (the fans them selves are usually OK).
It sounds like you're asking to see if you can add a "core" to your G5. If so, that's not a possibility. Dual core is nice but the G5 is still a powerful machine. If you've maxed out your ram and running a good graphics card and you're still having problems running programs then you should consider an upgrade to a dual core/quad core machine.
Is this a G5 2.7, dual 2.5 with a multicore processor using a liquid cooling system? If so open the case and check to see if any liquid is actually leaking. See xlr8yourmac.com for a whole bunch of postings on the issue.