Windows 7: PC will just not boot up at all

describe the beeps ....

and go to bios and configure it in such that it gives warning tones incase of fan failure or other hardware failures ...

there are no beeps and yes i do have an internal speaker.
I cant get into bios the output is blank blackness lol.

Suppose there is an electrical problem which is shorting out internally, you plug in a perfectly good piece of equipment and it gets zapped!
OR
The ram in one system is not compatable with the other system.
OR
Licensing issues when changing component parts. Then explaining to MS what you did so you can reactivate the license.

The list goes on from there.

oh now i understand

can this be a m/b failure ?

i had kind of same problem with my pc!but i didnt replaced every part of it for sure as far as i remember....i touched it here and there and idk wat i did but in the end it started working as it was before it got toasted.
there can be two advice i can give u on this
try to replace SMPS only without changing anything else u had on it previously coz there are boot files stored in the hardware .
try to change the slot of ur ram ..if u have two rams maybe one ram is fried or mayb its slot is broken. exchange the ram slots, remove one ram , etc. I cant think of any other possibilty. Now if u get ur pc right and working do share with us wat made it that way and how u solved it in the end. Thanks.

i surfed the net .... is your GPU fine ? did u try to clean it

in net i found to check 3 thing ,, PSU , RAM and m/b

i rememberd now that i had two systems experienced the same problem , and we disposed them as we were told that the m/b is burnt . a third system - laptop - now has those symptoms and right now it is in reparing shop .

...

there are no beeps and yes i do have an internal speaker.
I cant get into bios the output is blank blackness lol.[/QUOTE]

the blackness describes no power is going to the system! either SMPS cable is gone or smps itself!

First thing I suggest is to download the manual for your motherboard if you do not have it. then disconnect all components that you do not need (all bar the video and keyboard) power the system and, referring to the manual, check the power status on the motherboard. Most cases have a "soft" power switch and I have seen this problem caused by either a defective switch or related cabling, led's on the M/B should indicate if the power switch is active. It may be a M/B fault but it's another thing to check