Hi there,
This problem could be due to carious problems.
1) Your motherboard is faulty.
2) Your Processor is faulty.
3) Your RAM chip/s are faulty.
Firstly, you will need to unplug your computer and open it up. Then you need to locate the RAM which looks like this:
Remove one piece of RAM (assuming you have more than one piece) and try to start the computer again, then if it doesn't work, remove the other chip and reinsert the chip that was first removed and try to power up again.
If it works, then one of the RAM chips were faulty and you will need to replace them.
If the computer still does not work, then either your Motherboard or Processor are faulty.
You should then buy a new motherboard which isn't too expensive (be sure to buy a motherboard that will fit in your computer and will also be able to handle your processor.). Place the motherboard with the RAM in to the computer case after removing the old motherboard. Then carefully remove the processor from the old one and put it in to the new one.
Be sure to re-insert any cables that you have unplugged from the old motherboard in to the new one. Then try and power up once the machine has safely been closed again.
If the computer works, the motherboard was faulty. If it still does not work, then your processor is faulty and you will need to buy a new processor and install it.
Alternatively, you can take the computer to a repairman who will test the various components which will save you the hassle of doing all of that work and it will also save you the cost of having to buy new RAM and a new motherboard if in fact it is actually your processor that is faulty.
Thank you for using FixYa! Have a great day and please remember to rate this solution.
Best regards,
BearWeb