My PC return to worst

[amierule]

dear all expert..
I've a problem again...when i start my computer..yesterday morning there have no display....but no beep sound during POST.I swap DDR ram
and clear CMOS jumper and replace the battery for some possiblities...
no..effect at all...

My friend said that this cause by CPU...is that true...what sympton that show it all caused by CPU...
Help Me.....

[Sylvander]

Hello amierule

I'm using diagnostic flow charts.

1. I'll assume the PC is not dead because you have lights etc.
2. It appears that POST did not run and that there were no audible beeps. This is, therefore, a POST problem.
3. I will assume that the power supply voltages are correct.
[test if possible]
4. Disconnect all peripherals and system adapter cards except the keyboard and monitor.
[After switching off and disconnecting from the power source naturally]
5. Boot the PC and if POST still does not run you have a fault in the system board or something on it. [This is only if your power supply is good].
6. If it does run; re-connect the floppy,
[and run advanced diagnostics if you can and test the system board. If the system board fails the tests then it is faulty. If it passes the tests]
then:
7. Switch off, re-connect one peripheral or adapter card and reboot. If post does not run then this last item is faulty.
[If it does boot, test this last item with the diagnostics software. If it fails the test it is faulty.]
8. Repeat step 7 until all items are reconnected
[and tested then re-test the whole system.]

P.S. If you don’t have diagnostic software do what you can without it.