What's my problem with this G5? Help needed.

I have an iMac G5- early 2005- running Tiger.
During boot up there can be a black screen and that's all, no furter, thus I must do a reboot.
No booting into OS.
If the system does boot-up it might take anywhere between 3-10 minutes to do so.
Other than that most of the operating of the machine is fairly ok. Sometimes there can be a serious delay for windows to open or changes to ocurr but that's not usually the csae.
I used the Disk Utility -at boot- based on someone's recommendation but the disk had no errors, seemingly.
The disk is partitioned into 2 disks. The second partition is called 'Storage'. It is not available or present[doesn't appear on the desktop] during use of the OS.
In D.U. it appears as a greyed out word...but I can run first aid and it proves to have no errors and the disk can and is verified, however it is not accessible.
It was sent off to be repaired, but the result is inconclusive.
There have been no changes at all, to either hardware or software.
Any thoughts or ideas?
Thanks.
Chris
Message was edited by: C K2
Message was edited by: C K2
Message was edited by: C K2

I rang apple care and after much time of listening to some fairly nice selections of music, I was informed that there was nothing that could be done with this machine as far as apple were concerned, so.
I asked techy whether I should get a new hdd. His reply was, use a second hand one, don't waste your money on a new one, so.
Took off back cover - 3 nuts on base of screen. Undid the 'grey plate' that sits on top of the access point to the hard drive. Undid 3 securing screws, undid cables - be careful to note the orientations of each of these - released the 2 hdd cables - one is for data transfer, the other is the power cable - then 4 screws holding the hdd in its housing. that was it...just reversed everything to replace.
Then did a re-install of OSX Tiger. All's well. The system is very quick compared to its previous state and no problems so far.
I did replace the hdd that was in this machine with a better model - Seagate - and a bigger size.
will keep you posted.
Just for those who may find their machine out of warranty and they might feel like having a go at this procedure - if the situations are similar - it's worth it and in a sense, you might have nothing to lose.
Be careful !, take your time !...and keep in mind each and every action you take, so you have a memory or a map of the things that you do/did.
good luck to you.
Chris

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