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When mounting a motherboard to the case you need to add some spacers between them so the MB doesn't contact the case directly, most the MBs today have a protection to shut down so they don't get burned
Try starting your computer outside the case (you can use a key or a screwdriver for the power pins to start it).
From the information you have provided, it seems that you have replace your motherboard. That being the case, your present configuration doesn't recognize the new motherboard.. Try booting into safe mode.
I told another guy the same thing about a different board. Samsung doesn't even acknowledge mother boards because they sell generic boards to pc makers. Best way is to take the power wire from the case & start at the pins closest to you on the front panel connectors (fpnl on the board) & try each set of pins one at a time until it turns on when you hit the power switch. The reset is usually right across from the power. I've had to do this numerous times,so don't worry about frying anything.
Believe it or not, clearing the CMOS might actually help. Make sure you do it right by completely unplug the power cord or turn off the PSU, then take the battery out.
It also sounds like the CPU might be too hot. Look under the fan of the heatsink and see if there is any dust that will block the airflow. When the computer is on, touch the heatsink and feel if it is really warm. If it is really warm, it's a good sign, you might just need more airflow. If it is cold, you might need to reinstall the heatsink/apply new thermal compounds.
start by removing everything, ram, any cards plugged in, drives etc. Then try and boot it. If the issue is still present, shut it down and remove the heatsink and cpu. I have known CPU's to be jolted out of their sockets after an impact. Take the heatsink off, lift the lever and remove the cpu. Check that all the pins are still aligned and straighten any bent pins then refit the cpu and lock the lever down. Refit the heatsink making sure that the heat transfer pad or heatsink paste is still present and lock it down. Plug the power cords and front panel wiring back in and try and boot it. If it boots, shut down and refit each item you removed one at a time, booting in between each item. If the issue arises again, the last item you fitted is the culprit. If you can refit everything and boot the system up, lady luck is with you. If you still cannot get it to boot after refitting the cpu, replace the mainboard.
Sorry but without special gear, locating a fault like this on a mainboard is a real pain..
Unplug the power from the wall socket. Open the case and remove the CMOS battery (coin type battery) from the motherboard. Leave out for a minute or two and then refit (make sure you put it back the same way as it came out. Connect power and test.
It seems like you have done most things except 1 Try your power supply fan it could be clogged up with dirt and dust as a first try Vacuum it out failing that remove power supply and try cleaning out of computer
When connecting IDE devices in your computer, there are a few rules you need to know about.
First, Master and Slave devices are different for the 80-wire cables and the 40-wire cables.
Inside your computer, you generally have two (2) IDE hard drive controller connections. They look this this 99% of the time:
[ The smaller one on the very top is a floppy drive controller connection )
A couple things: Is the BIOS giving you an error beeps? Also, does the motherboard have Integrated graphics? Sometimes if the Integrated graphics are enabled, it can cause the graphics card to not display at all. You also might want to check that the CPU doesn't have too little or *more likely* too much thermal compound on it. If the thermal compound is on the bridges of the CPU, this can cause the machine to start, but not boot to the BIOS.