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One Other thing I forgot to state even though I wrote too much anyway,
I forogot to state that had diagnostics check running to follow temps on the video card, and the temp was really rising there as well. The card I was running was an agp Matrox Perhillia 256mb type. This card had its fair share of use and it is possible that due to it being near the end of its life to cause the limbo mode. If there is a video card in a motherboard slot and is DEAD it will not make bips as well in many mother boards unlike if the video card is not pluged in properly or at all where you will hear bips to indicate no video card or error with it.
Before replacing anything if all fails to test a new video card so you don't have to follow with the mother board test from above. It is possible that my no boot up mode , limbo mode was caused by overheated video card and not the over heated cpu, however as I said above I can't confirm this as neither of them were dead to fully confirm this and in my case the computer just kept on working after the 48h (max) period.
Best Advice I can give again is clear up all fans , ram for dust etc, clear the fan or heatsink of video card if possible, as well as CPU, If the video card is NOT an Onboard type try swapping for another and reset computer, If it starts up normally straight away then your video card is dead or near death like mine is. If not continue to check the Motherboard.
Good Luck again and this was of some help