I have opened the console again. Only 4-8(1 green blink) and 5-8(2 green blinks) seems to be working for my console. Set the dips to 2-8(8-2), nothing happens, only green light blinks I stopped it after 20 blinks.
Yes post was getting really long, imagine me sitting in my room with the Xbox for over 48 hours, no sleep nothing

. My week offs all gone but finally happy.
And doing this not at all headache for me when comes to you guys. Thanks for all the support. And the fan sound that I was referring to is still there whenever CR4 glitches (green blinking light) the console. With 4-8 and 5-8, its only one or two sounds from the fan and as soon as my system boots into dash, it is back to normal.
I hope the above info helps. If you need to know something else, please let me know. Otherwise, let me know if I am good to pack my console back. Also, like someone said, the fan sound is common with some coronas.