If your motherboard does not post or it powers up but nothing shows up on your monitor even thou the monitor works and its pluged into the computer, try these things...

1) Remove power source from motherboard when operating on motherboard, so that no damage comes to you or the computer.

2) Check memory.
Reset memory by removing the memory from the motherboard and snapping it back into place.

3) Clear CMOS. 
On your motherboard is a physical "jumper" or switch that brings the motherboard CMOS settings back to defaults.  CMOS is the data part of your BIOS where settings for your hardware are stored.  Refer to your motherboard manual to find the jumpers that control RESETTING the BIOS.  |

4) Check the processor. 
Carefully remove the processor from the Socket and put it back into the motherboard.
Carefully check for hairline cracks and or bent pins. If you find a hairline crack in the chip its broke get a new one, however if the pins are bent carefully use a small tiped knife to reset them!!!Don't break them if you do its broke don't try to use it it might burn up your computer. 
MAKE SURE that the CPU Heatsink and Fan are attached correctly.

5) Reset your Video Card. 
Remove you external video card and reinstall it.

6) Remove the motherboard from the case. 
Try to post the motherboard outside of the case to eliminate the possibility of “grounding” problems.  Place the motherboard on some NON CONDUCTIVE surface and connect the appropriate ATX power connectors.  Find where you would connect the “Remote Power Switch” to turn on your motherboard.  If you short these two pins out, it’s the same as “PRESSING” the power switch on your computer.

7) Check power supply. 
Check the switch on the back of the power supply.  Remove the ATX Power Connector and make sure your “4-Pin” or “P4” connector is also plugged into the motherboard. 
Most modern motherboards utilize both a 20-Pin ATX Power Connector in addition to a “4-pin” P4 connector (normally yellow and black wires).  Some SLI and other motherboards also utilize an additional 4-pin power connector that is branched off of the main power supply, but is only required when using TWO SLI Video Cards.

8) Try different memory. 
Not all memory modules will work with all motherboards.  The physical chips that are on the RAM or Memory may be configured differently from manufacturer to manufacturer. 
High Density memory may only work with certain motherboards and not with others. 
If you purchased a 512 pc2700 memory module for $15.00… it is more than likely HIGH DENSITY and will not work with Intel or nVidia Chipsets.  Just because the rating of the memory is PC3200 or PC2700, etc… does not mean it will work with every motherboard.

9) Try a different monitor card.
Some of the new computer have built on monitor adapters but those can go bad, just place a new or used monitor card in one of PCI slots and try powering the system back up.
Now if you got of the older models, just replace the monitor card with a newer and compatible card.

10) Remove hardware and cables that are not required for the motherboard to post… 
In other words… go back to the basics. 
All that is required for a motherboard to “POST” is a Video Card and Memory.
If some jumpers from your hard drives or a card is not working correctly… this may interfere with the motherboard posting and cause it to “FREEZE.”

11) Check your user book
Check the user that came with the motherboard.
Sometimes a jumper pin may have fallen off, or isn't on...
If you don't have a manual check the internet for a webpage, that webpage should have a online manual that you could just simply download and print if you like..

12)Check processor again!!! 
Did you just install a new processor???  If so… put the old processor in and see if the motherboard posts.  If it does… maybe your motherboard requires a BIOS UPDATE in order for the processor to be detected!  If you have the latest BIOS, then maybe the NEW processor is bad OR maybe it is NOT COMPATIBLE with your motherboard.

If none of this work try contacting a pro or buy a motherboard reader from ebay or your local computer hardware store..
!!!Remember!!! Always remove power source from motherboard when operating on motherboard, so that no damage comes to you or the computer..