Computer fires up, but won't boot.

[Pingu!]

Hey. So, the problem is, computer fires, but won't boot. Usually, there is one beep before windows start to boot, but now nothing. By meaning computer fires up, I presume it works because all fans are working, green led on front (meaning it's on) works, and because of that, I think it's not problem with power supply.
Next, I tried removing battery from motherboard, and inserting it again after one hour or so, still nothing. Tried removing all rams (4x 1gb, 800MHz), and then just adding each one of them, one at the time, and firing it up, I thought maybe one just died. Tried booting without ram. But it still didn't boot. Tried cleaning it, it was a bit dusty, but eh, guess what, haven't made a difference.

So, any ideas what to do would be great.

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But you either follow our rules here and work with us - or STFU and GTFO.

[Bloody Reverb]

Maybe your CPU is broken...or hard disc .Take your CPU out from motherboard, and then put it back. And controll all your cables. I hope it will start.

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[Asgardian]

So do you get any screen at all when you try to power it up, or absolutely nothing?

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[Pingu!]

I'll try removing CPU then and checking HDs again.

@Asgardian Absolutely nothing. Screen just stays black (but LED is blinking, meaning screen is turned on). It doesn't show "check signal cable", or similar stuff, meaning it's connected to PC, but still nothing shows.

Edit: CPU and hard disks seems fine.

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But you either follow our rules here and work with us - or STFU and GTFO.

[Cond0r]

Its your monitor, not the PC.

The same thing happened to me a few months back. The PC booted up and was running, but the monitor never turned on, the LED light on it was just blinking all the time. So yeah, try connecting it to another monitor if you have one just to confirm, but Im around 90% sure thats the problem.

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[17:23:05] Mini Me: pls
[17:23:06] Mini Me: gtfo

[Primitive]

Its your monitor, not the PC.

The same thing happened to me a few months back. The PC booted up and was running, but the monitor never turned on, the LED light on it was just blinking all the time. So yeah, try connecting it to another monitor if you have one just to confirm, but Im around 90% sure thats the problem.

No it has nothing to do with monitor, its missing a beep at booting up. And there might be couple of things causing that, but primary as someone said its CPU or HD in most cases.

If you have spare CPU try to switch on it and see does it work.

[Stygian]

I'd do what the others suggested and start replacing components with spare of borrowed ones till you find the problem. Without an error beep it could really be anything. Monitor, video card, motherboard or CPU are the most likely things.

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[Not Espi]

try a different hdd.

[Cond0r]

No it has nothing to do with monitor, its missing a beep at booting up. And there might be couple of things causing that, but primary as someone said its CPU or HD in most cases.

Oh, I missed that part in the OP. Ah well, everything else he described is the same as it was in my case, so dont know.

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[17:23:05] Mini Me: pls
[17:23:06] Mini Me: gtfo

[coffee]

Had that one.
Easier to get a replacement mobo.
Could be anything.
And yeah... switching hdd's wont help cause it reads the bios first.
So...
No bios = no nothing
Just get a new mobo