My macs freezing after about 5 mins

Hi guys, really stuck here, started mac g5 earlier and was running fine for about 15 mins, I then left it to make a cup of tea and came back to it being frozen with loud fans. Turned it off by holding power button and thought maybe I should clean her out while I'm here. Did that not much dust put it back together and switched it on. After 2-3 mins it froze again so I switched off again using same method as before, then tried switching on, no chime, and both screens blank. Oh no. Off and on again still nothing. Read some forums and tried wiggling and turn battery and then it booted fine. So as soon as it booted I tried the disk utility and checked main disk. Verified worked fine but then I tried verify permissions and after about another two minutes it froze. So switched off again, swivelled battery as rebooted, left it to see what happened and it froze again about 2-3 minutes after booting. It an old 2005 model which I bought second hand about 9 months ago off eBay. It works perfectly until now. I installed a second hard drive just after I bought it with no issues at all. I realise it's and old model, but with wanting to produce music and knowing macs are the nuts for stability, having 3 kids and no free cash it's all I've got and too be honest i class it as my 4th child. I treat her good, clean her, don't run her in high temps, keep dust away etc. if anyone could help me Id really appreciate it. I'm lost with out it and if it's dead then I'm screwed. One more thing. About a week ago I finished using it and clicked shut down and walked away to which then randomly one of the house fuses ( as in main fuse for house) tripped. Didn't think this had anything in common as the wife had hair dryer and iron on etc. thanks anyway guys. Fingers crossed.
Update, the only way I can get it to boot is to remove power lead, open side panel and swivel battery round. This morning I got it to run for 10 mins.
Haw checked disk by doin fsck -fy in to which I did it a couple of times until volume ok message was shown.
Have thought maybe a psu issue but no pops or anything when turning power on at socket. It does make a click sound but it has always done that and also my graphics equaliser does the same.
Pls pls pls help me.

Is it a LCS model? Any 2.5 GHZ and the 2.7 GHz models are LCS.
PowerMac G5 Coolant Leaks/Repairs
Have you checked the temperatures?
Use Temperature Monitor to see what the CPUs and the memory controller temps are:
Temperature Monitor: Description - Marcel Bresink Software-Systeme
Does the memory report correctly in the System Profiler/Hardware/Memory?
Any errors reported in System Profiler/Hardware/Diagnostics?

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