Won't boot up

We cannot assume that your motherboard is dead, try these: Unplug computer power cable from the socket outlet.


First, check to be sure the power supply is switched to 120 V.
If it is, then do a minimum system configuration test. Turn off the ON/OFF switch on the PS back panel, and disconnect the cord. You don't want to work on the motherboard (MB) with standby power applied.
Disconnect all components from the motherboard (including floppy, CD, hard drive). Leave the power connector attached to the hard drive, as the power supply has a minimum load requirement (never run a switching supply without a load, unless it is designed to do so -- and few are). Remove the power connector from the Motherboard, then reinsert it (potential for bad contact in control circuit).
Remove the RAM, reinsert one stick (going for a minimal configuration).
Remove all PCI boards and AGP. The motherboard should be able to turn on and beep an error code even without RAM and video.
Plug the PS back in, turn on the back panel switch, and use your screwdriver to short the power button pins (ATX type of supply).
Double check which pins are the power switch pins in the documentation, as front panel attachment point functions are usually not obvious, and are easily mis-wired since the connectors come off so easily during maintenance.
When you touch the pins, the CPU fan should instantly start turning, and shortly thereafter, the MB should beep an error code.
If not, check the mounting for the MB. Some cases use a U shaped rectangular snap in receptacle for MB mounting screws. These commonly become bent or twisted, and can short out nearby traces sometimes resulting in dead board symptoms.
If the fan didn't start turning when expected, you probably want to repeat this minimum configuration test with the motherboard out of the box.
Put it on an insulated surface (e.g. pink packing foam or cardboard), being careful about electrostatic discharge (ESD) (however, my bet is ESD damage that disables a motherboard is rare).
Although I haven't seen it, your motherboard may require the video card to be plugged in to turn on.
I doubt this, though, as there is enough housekeeping to do before checking for the video card that the fan should have time to start to spin.
If it still isn't working, try the other memory stick, or remove all memory.
Double check all connections before applying power!

Is your computer beeps while it starts - replace the ram and check with other ram for it bus speed - you can find it speed on a small sticker if they are same then install

Then you remove CMOS jumper to clear also same time unplug the power cable (20-24pin) wait for some seconds then place it back and also set the bios CMOS jumper to normal.

Restart the pc

We did most of the problem solver solutions then if also the problem exists may be you some wires you removed or get loose or may be you damaged the ram slot or ram check those
things