10.10 painfully slow on 2008 iMac 2.4gHz intel core 2 duo

I made a big mistake-
My gf sees me as the guy who really knows Macs.
I updated her 20" iMac 2.4gHz intel core 2 duo (3G ram) when the prompt came up in software updates.
Now she's practicing patience as everything is much slower and problematic in keeping connected to the ISP.
Accepting that the Mac has to re-index everything, we've allowed 3 days for this, but not much improvement.
The question:
What is Best Practices (and detailed method) for getting back to her previous OS without the install disk?
This is probably best until we can get a new Mac on her desk.
Is it better to stay with 10.10.1 - if so, we need to speed this puppy up.
Any help?
Message was edited by: Joe805

The first problem may arise from the fact that iMacs use 3.5" harddisk whereas most SSDs are 2.5" ones.
So some sort of tray or 'holder' is needed.
Second problem might be the thermal sensor Apple uses in some iMacs.
Your first recommendation to your friend: 'get a bigger harddisk and more RAM' sounds like the best way.
Stefan

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    So I set it all up again, left it overnight and this morning it was dead again. So now it leaves me to wonder if it's something I have plugged into it.
    I have a new Seagate 3TB external hard drive hooked up using USB3.0. This is plugged directly into the back of the computer.
    I also have a powered USB hub plugged into the computer which has regular USB stuff such as printer, graphics tablet and another external hard drive (this one is older LaCie 500gb, and have put it into a new USB 3.0 case as well for the arrival of the new iMac (this had an old firewire hard drive case). However this hard drive is switched off at the case and is not being used.
    I believe it could possibly be the Seagate 3TB disk causing this problem, but it works fine during the day while I am using the computer, it's just when I either leave it at lunch time to go to a meeting or walk etc or overnight that I come back and it has shut down....leaving me to believe that it's due to the computer going to sleep.
    Has anyone else had a similar problem with a Seagate drive? Today I'm conducting an experiment and heading off for lunch with both hard drives unhooked. If I come back and the computer wakes up from a click of the mouse or keyboard as it should, I will plug in one hard drive at a time and re-test. I will leave the Seagate for last, as I don't think it is the old LaCie disk (which is off).
    For reference sake, I also have a NAS running off my network through Airport Extreme etc and have my old iMac hooked up to the network too, but don't believe this is the problem.
    Initially I did put in some after market RAM (another 8GB) and though that might be the problem, but I removed and it still reacted the same way (plus store I bought it from again booted up fine and woke up fine at their shop after I had taken RAM out too).
    Will keep this post updated with my next test (letting computer sleep without either hard drive in), but keen to hear if anyone has had any similar experiences with Seagate disks/cases and the new iMacs.
    Cheers,
    Kristin

    Hey kristinandmike,
    I had a similar problem shortly after I bought my 27" iMac. Here is an excerpt from my discussion:
    "As BDAqua suggested, I started the process of elimination by shutting down the externals and just leaving up one of the USB drives and using the computer until time to shut it off. After eliminating 2 of the 3 drives I figured it had to be the last one. That drive is a Seagate GoFlex Desk version that allows different bases with differing connectivity. I had previously used FW800 to connect but had switched to USB3 on the new computer. I went ahead and got a Thunderbolt to FW adaptor cable and switched this drive back to Firewire rather than USB3. So far so good."
    For some reason the Seagate I was using didn't agree with the USB3 on the Mac.

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