Upgrading the iMacs

Hi. I'm looking to upgrade from my Mac Mini to an iMac and I wonder how easy is it to upgrade the iMacs and what am I able to upgrade?
I am looking to pickup a 27" iMac from the UK online store with as low a spec as possible and upgrade it myself. I figure I can save myself hundreds if not thousands of pounds
Any ideas?

Upgrading computers every time a new one comes out is a losing game really because they come out some frequently. I wouldn't get too upset, if your computer does what you want it to and continues to do so then forget about it. When the computer no longer serves your needs that's the time to start looking to upgrade.
As far as upgrading your existing machine, well good luck with that. As has been stated (many times) the only user upgrades iMacs are intended to do is the RAM. If your machine is covered by AppleCare or still under warranty when you try to upgrade items like GPU's and CPU's that jeopardizes your warranty. Of course if you don't care about the warranty then that point is moot. There is contention about what components are upgradeable within iMacs, the only things I've seen for sure that are are RAM and internal HD's however as stated even the HD's aren't intended to be user upgradeable. For someone that doesn't mind taking apart a reasonable complex machine a HD is doable, for the faint of heart no way. As far as GPU's and CPU's, at the least it's would probably be difficult to source the parts and if you can probably cost prohibitive.

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Thank you for visiting Apple Support Communities.
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I am very very fond of these type of iMacs so I am looking to buy one from ebay!
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B. Upgrade the processor to a Intel Core 2 Duo (If so, how?)
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No. You can try Lion:
Upgrading to Lion
If your computer does not meet the requirements to install Mavericks, it may still meet the requirements to install Lion.
You can purchase Lion at the Online Apple Store. The cost is $19.99 (as it was before) plus tax. It's a download. You will get an email containing a redemption code that you then use at the Mac App Store to download Lion. Save a copy of that installer to your Downloads folder because the installer deletes itself at the end of the installation.
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Upgrading the iMac 2009

Will 8GB of ram support the iMac 2009 Model Number (MC015LL/B)
http://support.apple.com/kb/SP616
Thanks

Yes. Try OWC, DataMem, or Crucial.com for suitable RAM. OWC should have video tutorials to help you. Consult your computer's user manual for assistance. I believe it's in Chapter 3 - Adding Memory.

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Hi all,
This is proving somewhat frustrating. End goal is to upgrade the iMAC to Lion. However, in order to use the downloaded version of Lion Install package, i have first to upgrade my iMAC from OSX 10.6 (i.e. I need at least 10,7 to get access to the APP store).
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best regards and thanks to anyone who might offer suggetsions to help.
Buck.

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I am using Snow Leopard 10.6 (re-installing as we speak). on an iMac.
Have verified startup disk as well as verified permissions.
Have cleared the PRAM (using option-command-P-R keys and waiting for the chimes).
Only peripherals are an apple usb keyboard and an apple usb mouse connected via keyboard usb adapter.
Machine runs fine at 10.6
problem only occurs when i try to reboot after installing the Combo upgrade.
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ciao, Buck.

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Before we get too far, please clarify this part:
I have a 2009 iMac 4,1
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Do you have that problem when running in the Firefox SafeMode? <br />
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[http://support.mozilla.com/en-US/kb/troubleshooting+extensions+and+themes]

Upgrading the iMacs

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