Please help new to macs and my recently purchased power mac keeps freezing :-(

Hi apple community!
I recently purchased a power mac g5
Specs;
G5 power mac dual core (2.0)
Power pc 970 mp
Late 2005
I don't have an apple mouse/keyboard
I just use $40 wireless mouse keyboard.
Upon purchase everything seemed to work as it should....booted up, open and closing apps without freezing.
However I never had it connected to the Internet when I navigated through system.
I got it home and installed a 1 tb harddrive (WD mainstream desktop) from future shop. When I installed it in tower I had to buy a sata 2.0 cable as there was not one available for use. Booted up fine and installation went as my research said it should. Turned it on next day....
Tried to update iTunes and this is where it started actin up. First just froze had to turn off, second time wouldn't even boot up plus fans went into overdrive. Third forth fifth sixth boots fans sometimes kick in, now whenever I try to do any kind of action it freezes. (Only when I click something)
I read about possible power suppy issue, so I plugged tower and monitor into seperAte plugs,
They may however be in same circuit because they at in the same wall...would a power conditioner fix this?
Anyway still froze on any action tried...just opened disk drive...opened then frooze...?
Anybody have any ideas??
Please help
Not sure if this is correct OS ( looked up using serial #)
Max operating system OSX 10.5.8 leaporad
Earliest supported OSX version ; 10.4.2 tiger.

Sorry for the late reply. I want to thank you for taking the time to help me.
Not sure exactally where I could get something like this your speaking of.
Update; I have removed the harddrive and will most
Likely just use an external one, if the computer will even work.
I ended up taking it in to geeksquad at best buy, they had it for 3 days and also told me after the fact that neither of the techs working on it knew much about macs :-( needless to say I requested my
Money back due to the fact that the service I paid for could not be completed and literally couldn't tell me anything more than what's below.
They told me that they could not dock it with thier diagnostic machine, kept restarting on them and the one fella said it was overheating but had no idea why. When I brought it home again I tried it once more computer boots up to desktop as usual, this time had a asterisk window saying " the computer was restarted after mac OSX quit unexpectedly" however my cursor was again locked in the top left of the screen. Would not move, so I could not view the report, shortly after fans kicked into overdrive. I'm losing hope for this machine rapidly. I'm all ears when it comes to anything I may be able to do.
Should I try an actual apple keyboard/mouse just to eliminate that possible?
If you have ideas AWSOME, If not, no worries, ill take it into the mac store and see what they say
P.s the machine is clean inside little to no dust and the tech said he was going to clean it out, hard to tell if he did because it was clean clean before I brought it to him.
Thanks again for the help you have given me so far and in the future
I look forward to hearing back
Sincerally
Al

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