IMac G5 intel core 2 duo Mac OS 10.6.8 running slow

iMac G5 intel core 2 duo Mac OS 10.6.8 running slow.
It was bought over a year ago on eBay, and I don't have the original install discs.
Recently simple tasks take ages and I see the spinning beack ball alot.
I ran disk utilities, varified and repaired permissions, with the conclusion that there are errors and "disk needs to be repaired".
Without the original install discs, is there anything I can do?
Many thanks, Brion

Hello K
Thank you for that. It does make perfect sense. And I was quite surprised when the guy at Apple Care said that store bought OS discs are the equal equivalent of the original grey discs. However, I was also kinda relieved, because I have the Snow Leopard discs and I don't have the original grey discs, so at least I have a chance of fixing the problem.
To clarify, I am not intending to upgrade the OS. The iMac originally came with 10.4. It was upgraded to 10.6 when I purchased it on eBay for £220. Now, 14 months later, after working perfectly well, it has developed some minor errors and has become sluggish. Running Disk Utilities, it seems the disk needs to be repaired by starting up from something other than the iMac harddrive. I had thought that meant the grey discs. But Apple tell me I can reboot from the Snow Leopard disk and repair the iMac that way. That isn't the same as ignoring the problem and reinstalling a new OS on a corrupt harddrive.
BUT, I haven't done it yet. When I reboot from the Snow Leopard disc, I'm hoping I get more options then simply 'INSTALL'. Apple Care tell me that I will be able to navigate my way to Disk Utility. I hope they are right.
Wish me luck, and thank you again for taking the time to help me out. I really appreciate it.
Brion

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