IMac 21.5 mid 2010 after tone only logo no wheel what's wrong

First I was told that the graphic card was shot by apple repair agent, or the logic board or the LCD screen. Pay my fee for the so called diagnostics.
So step 1 was thinking it could be the GC so I got one and added to the logic board. The reason why, I had the coloured line up and down the screen. I thought from windows PC's when the G/C want. Anyway Got it going with the new G/C. But the out side housing got really warm. So I shut it down and checked the installed logic board. But found nothing as I thought I had crimped a cable. All back together again and now it only boots now and again. I removed the HD and installed one other HD but now it just gives a the tone and the Apple logo only and nothing happens. I have held the option button down and what comes up on the screen is the HD with green little light on the right side front and under that is Macintosh HD. The arrow is pointing to the HD. If i click on the arrow, the screen goes back to the Apple logo again and nothing happens. O yes the HD in it now is from a 21.5 late 2009.
So should I go back add the HD that came with the iMac or buy a new HD as I am sure the way that it was starting up some times and not others.
John

If I had a external drive I would try it. I cannot get any thing to show on the LCD screen to use Target Disk mode. It will not go into safe mode at all.
When you check the 4 led's on the logic board # 4 doesn't light up. So I went through all what it said to do and still nothing. So I decided to change the graphic card and it booted into my home page. But top side of the housing was hot. So I turned it off. checked every wire, all the connects and made sure all was okay with my eye. Tried booting again and it wouldn't. just the Apple logo and spinning wheel. Next time I tried it booted into my home page again. But this time after the gear wheel stopped I got a blue LCD screen then into my home page. next to try and start it again, Apple logo and spinning wheel only. Changed the HD but nothing now just the logo. So why am I receiving the heat. I think it is from the LED board next to the power board??????????????????????????
All the cables are in the right place and have not been pinched. So I am lost with this one. So I'll remove the HD and put back the HD that came with it.
john

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IMac 21.5 mid 2010 after tone only logo no wheel what's wrong

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