Getting a imac g5 all in one power pc 1.8 gb os x 10.3 computer. can i upgrade to snow leopard v 10.6.3 with disc ?

Run 'Software Update'
This will bring the OS up to 10.6.8
Keep running software update until the system is up to date.

Check out http://store.apple.com/us/product/MC573Z/A/mac-os-x-106-snow-leopard

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  System Requirements

  
  
  Mac
  • Mac computer with an Intel processor
  • 5 GB free hard drive space
  • 1 GB RAM
  • DVD drive for installation
  
  

Please provide more information.
To what would you like to upgrade it?

Since OSX Mavericks was just announced, I'm going to assume that's what you're wanting to upgrade to.

Not all Macs can run Mavericks.

Mavericks Capable Macs

Mavericks, like its predecessor Mountain Lion, requires one of the following Macs with at least 2 GB of RAM and 8 GB of available hard drive space:

• iMac (Mid 2007 or newer)
• MacBook (Late 2008 Aluminum, or Early 2009 or newer)
• MacBook Air (Late 2008 or newer)
• MacBook Pro (Mid/Late 2007 or newer)
• Mac mini (Early 2009 or newer)
• Mac Pro (Early 2008 or newer)
• Xserve (Early 2009)

If your Mac isn't one of the ones listed above, you won't be able to upgrade.

If you have an iMac, MacBook, MacBook Pro, or Mac mini model that was originally released in Early/Mid 2006, the latest version of Mac OS X your system supports is Snow Leopard.

http://store.apple.com/us/product/MC573/mac-os-x-106-snow-leopard

Leopard requirements/10.5.x...
* Mac computer with an Intel, PowerPC G5, or PowerPC G4 (867MHz or faster) processor
minimum system requirements
* 512MB of memory (I say 1.5GB for PPC at least, 2-3GB minimum for IntelMacs)
* DVD drive for installation
* 9GB of available disk space (I say 30GB at least)
Classic/OS9 Apps no longer supported.

$45.00 on Ebay.com - You can't do Snow Leopard.

I wouldnt see why not just read the specifications before the install

Have you got the Snow Leopard boot disc that came with your machine?

Pop it in the iMac, restart the computer with the "C" key held down. That will boot the imac to the DISC. Once there go to the top menu and run a Disk Utility Repair on the hard drive.

Let me know what happens, I can help with this ;)

I had the same problem. Upgraded from G5 PowerPC Tiger OS to iMac Snow Leopard. Have a Snapscan 1236U (ScanWise) and got the same error message ("cannot find the current ColorSync System Profile"). Downloaded trial version of VueScan (www.hamrick.com) , scanner worked, so purchased the VueScan Professional Edition ($79.99) (Standard Version is $39.99). My scanner is now working GREAT!

If it is a G4 PowerPC processor No
If it is an Intel Processor Yes

You can find useful information on site? http://www.epson.com/cgi-bin/Store/support/SupportSnowLeopard.jsp Mac OS X Snow Leopard Support Contact Support Welcome to Mac OS X Snow Leopard v10.6 support for Epson products. Here you can find out how to get drivers and other Epson software for your Epson product that work with Mac OS X Snow Leopard v10.6.
Check your Epson product CD to see if it already contains Macintosh OS X 10.6 drivers. If the CD indicates support for Macintosh OS X 10.6, follow the instructions that came with your Epson product to install your drivers and other software.
If your Epson CD does not indicate support for OS X 10.6, DO NOT INSERT YOUR EPSON PRODUCT SOFTWARE CD IN YOUR SNOW LEOPARD COMPUTER. Follow the step-by-step instructions below to obtain the latest software and utilities for your Epson product as they may be needed for this new operating system.
Good Luck.

1.: Find the disc that came with your iMac that says "iMac OS X Install DVD"
2.: Turn on your iMac
3.: Insert the disc into the SuperDrive
4.: Turn off your iMac
5.: Press down on the "Option" key on your keyboard, and keep it held down
6.: With your other hand, press the power button on the back of the iMac for 1-2 seconds
7.: A screen should come up with a picture of a hard drive, and a picture of a DVD
8.: Let go of the "Option" key
9.: Using your mouse, click on the arrow under the picture of a DVD
10.: Follow the on-screen instrustions, which will guide you through the process of re-installing OS X Leopard on your iMac