It sounds like you have moved along but no luck yet. Your trouble is not Windows 10. Not the hard drive as you stated you tried different drives. I do not like the sound of sparking as you plug in the power supply, it should not be drawing enough current to spark as you plug it in.
So lets start over, remove all cards plugged in to the motherboard and remove it. Look to see if any of your stand off the board would screw into are out of place touching the back of the board, Check and then check again. If this is ok, remove the processor and make sure it is seated correctly with no bent or missing pins, carefully put the cpu back in and scrape all the old thermal compound off if it had a pad type and use a thin smear of thermal compound between the cpu and cooling rad. Check the rad to be as flat as possible no lumps or bumps. Note only a thin swipe of compound is needed, not thick just a smear over the total cpu. Too much compound can actually hinder heat from being taken away. The fan speed sensor for temperature of the cpu is under the cpu in the area center of the pins. When I attach the cooler and fan I sort of wiggle it to positive have the compound thin out evenly.
Ok now put in only two of the original ram in slot one and three same color. Some power supplies have a temperature sensor that goes on the motherboard, this goes just up and to the right of the 24 pin power plug.
Your case will have a plug from the front panel to the board bottom right. The extra 4 pin from the power supply goes in the 4 pin plug up and to the left of the cpu. The cooling fan from the cpu ONLY goes up and to the right of the cpu The case fan only goes up and left of the top pci express connector. Use only one hard drive and serial port one and a black power connector. Use only the board video and keyboard plus mouse connector or the rear panel usb connectors, do not worry now about the other plugs . No optical drive only one hard drive, the 24 pin power plug, cpu fan, case fan, front panel start button in the cable. the 4 pin cpu power plug.
I have had a mounting stand off rubbing on the back of a motherboard causing havoc, I have had over thermal compound applied causing fan speed trouble. I have had a bad power supply spark when it is plugged in . Do not attempt to use a 20 pin power supply on a 24 pin board, some boards will work but you are trouble shooting the unit and no messing with plug. You are now trying two memory sticks, the onboard video, one hard drive, re done cooler, re seat cpu. Give this a try and I sure would like you to get or borrow a 24 pin power supply you know is good. It would not have to look like your power supply and can sit outside the case for test with the old power supply totally disconnected. It all sounds like the power supply, but then this new to you board may also be trouble. Let us know.
2 beeps is a memory fault every time. OK now you said you installed new ram memory, this motherboard is quite particular in the ram memory it will run. Go back to your original memory if you can, there is a windows 10 bios update and the fan speed is once again a ram problem. I had no idea of the fan speed related to memory problems but googled it and Lenovo has this happening. Ram trouble will cause many different start up problems, you have mentioned you took out one then back in and all this just could have been faulty ram. I just comment on the two beeps here then googled fans running hard. Not a fix just a hint for you to look at.
I have done recovery and disabled repair, and now its stuck at blue screen with dots for a while... FAN is still overclocking with the 2 new RAM removed ... not sure what i can do now, did you mean to remove all the RAM? im not sure if thats possible
Now the desktop beeps ONCE when starting, repairing doesnt start after changing it in the Command Prompt... changed RAM back to stock... FAN still over clocking ... and its stuck on the windows 10 logo and dots rotation... ends up crashing eventually... i for a moment saw f8 options when it came to recovery screen. It was not working before..
I am now getting 1 BEEP from the computer... i checked on google and it mentioned power supply, theres a 3 hole connector i plugged into the 3pin power on mother board. which stopped it from turning on... when disconnected it works... with fan overheating... any thoughts?
wow very interesting
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