Lagging, Crashes and weird start up

Hello! I have an iMac and for a few months I've been having problems. It started with my wacom tablet not responding or lagging then progressed to all my programs lagging or flat out quitting. Now when I say lag I mean a lengthy lag- to the point that working in Photoshop is impossible. I also have a problem during start up- I fire it up with the power button, it starts up and goes to the silver apple with the spinny thing under it and...thats it- nothing else happens. I power it down, shut it off and wait a beat and power it up again and it starts up completely, with no problems except the long annoying lag when I try to open anything. I tried an archive & reinstall which took 24 hours to do- maybe thats the right amount of time but it didnt seem right to me. Anyhoo, I fired it up again, hoping for the best and still I have an incredible lag. I went to JustAnswer.com and got a mac tech to help me with some diagnostics. This is what we did- a start up holding shift, then a reboot holding the "command & s" keys then I entered a fsk command which ran a diagnostic and came up with NOTHING! I had already run disk utility, disk warrior and Norton and all of those brought up no problems. I don't have any of my art on the computer anymore so theres no massive files hogging memory. I've chucked all the programs I dont use ( sorry garage band & comic life).Help! Please help...I am a not so starving artist and Ive always been able to trouble shoot & maintain a healthy mac myself w/o paying a tech but this has me stumped and pulling my hair out. Hubby has the exact same set up and his is healthy as can be. Taint fair I tell you! Any help would be greatly appreciated!

Hi Stawicki Studios, and a warm welcome to the forums!
Sounds like a Hardware problem.
Boot off your Install Disk while holding down the *d key*, (not c key), then run the extended Apple Hardware Test. Some disks require you to use the Option key at bootup to select AHT. Some models have a separate AHT CD.
One way to test is to Safe Boot from the HD, (holding Shift key down at bootup), run Disk Utility in Applications>Utilities, then highlight your drive, click on Repair Permissions, Test for action in Safe Mode...
Reboot, test again.
If it only does it in Regular Boot, then it is some 3rd party add-on, Check System Preferences>Accounts>Login Items window to see if it or something relevant is listed.
Check the System Preferences>Other Row, for 3rd party Pref Panes.
Also look in these if they exist, some are invisible...
/private/var/run/StartupItems
/Library/StartupItems
/System/Library/StartupItems

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    *https://support.mozilla.org/kb/Safe+Mode
    See:
    *http://kb.mozillazine.org/Firefox_crashes
    *https://support.mozilla.org/kb/Firefox+crashes

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