My Computer Can Not Open

When I open my computer, It doesnt have Bip sound which every open I have. And nothing in monitor. But fans and hdd and cdrom are working. I try to change Ram and Graphic Card from my other compiter but nothing changed. I take BIOS battery and wait. And nothing changed again. What it could be?

(problem starts with my mouse freeze but keyboard was working. I restarted comp and it can not open now.)

Thanks for Help...
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If it does not beep, it should be:
1) Dead CPU (after overheating or something)
2) Dead motherboard (check if capacitors are not deformed)
3) Dead PSU (check voltages when powered ON using multimeter, should be +-5% of the target values). It might still produce 12v, but have dead 5v lines.

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Peter HartCommented:
as barsmon says, sounds like a dead mobo/cpu  or a broken power supply. if it was just the RAM is would beep.
sometimes a build up of static stops all from working. - disconnect the power cable hold in the on button for 30 seconds. retry the power.
i suggest testing with the minimum setup - disconnect also all peripherals and network cables :
motherboard + cpu + 1 ram stick, video card, power supply
on boot, do you have a display?
if NO it is one of the connected, swap ram, Power supply, video card - leaving only motherboard and cpu
if Yes, add devices till the problem shows

you can also check the motherboard for bad capacitors as shown here :
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Remove ALL the RAM and then power on.  You should hear a continuous beep.  If not - the mobo is likely dead.  If you DO hear a beep, follow nobus' procedure above.

Nothing in Monitor ? Does the monitor power light is there ?? it could be a faulty monitor where cause of monitor show nothing but the CPU HD, fans ...etc still running .... borrow another monitor to try out and see .....
TKorhanAuthor Commented:
Problem is CPU Fan.
Thank for Help.
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