PC boots with black screen after changing hard drive

[Marty9231]

Hi,

So I bought a new harddrive, because my old one was too small. I removed the cables from my old one, put them in the new one and booted my pc.
Result: Black screen.

All the fans turn, no beeping, LED's work, I can hear my harddrive and my dvd-drive buzzing.

Something to note: My G15 Display does NOT light up, which it usually does. So my keyboard appears to be powerless.

I have tried removing the BIOS-battery, removing one and both RAM sticks, Disconnecting everything but the CPU, GPU and monitor. No luck.

The fact that my keyboard doesn't get power suggests a faulty motherboard to me, but I could be (and hope to be) completely wrong. I tried removing my GPU, but didn't hear any beeps (the power-chord was still connected, don't know if that matters?).

In short:
Computer seems to boot
Everything sounds like normal
No beeping
Unpowered keyboard
No luck on BIOS reset.

When I put in my new HDD, I touched the radiator, to get rid of static charges. Could it still be that a static charge ruined my MoBo or some other part? And is there a way to check if my motherboard is faulty?

Greetings,

Marty

Edit: I have now tried putting the motherboard on a static-free surface (wood) and connecting only the cpu, gpu, and monitor. Still the same. I find it strange that my motherboard doesn't beep because there's no RAM. Another indication of a broken MoBo?

Edit 2: I see now that I completely forgot to mention my specs:

Motherboard: Asus M4N78-SE
CPU: AMD Phenom II X3 720 BE
GPU: ATI Sapphire HD 4850
Monitor: ACER 22" x223w (I believe)

Edit 3: I left everything running for a minute or two, then removed my cpu cooler and touched the cpu. Turns out the cpu was real cold, like nothing happened. Isn't this a clear indication of a broken cpu?

 

[Tmagic650]

You need to image the old hard drives data to the new hard drive using one of the new hard drive's manufacturer's install programs. Did you do this?

 

[Marty9231]

This is definetely not the problem, as I'm trying to boot without even having harddrives connected.

 

[Mark56]

If you are not even getting the POST screen with the minimum of hardware connected I would first check your power supply. Get the pin out voltages for the motherboard and test the mobo power connecter with a volt meter. One or more of the supply rails may have failed, why this happened when you were only changing the hard drive is a mystery or an amazing coincidence.

As you earthed yourself before touching anything I doubt if you have caused any damage from static electricity. The CPU is the least likely component to have failed usless it has been consistently overheated.

 

[Marty9231]

I have just tested my PSU under load:

-Connected everything from my pc except the DVD-drive
-Connected my PSU to wall-socket
-Powered my system
-Measured the voltage-output of all 3 types (3.3VDC, 5VDC, and 12VDC) using a free SATA-cable.

The under-load results were all perfect, and did not differ more than 0.1 volt from the load-free test and the standard volt-chart.

I concluded my PSU was OK, and since all other parts have been accounted for, I'm suspecting my motherboard.

 

[Mark56]

That sounds fairly conclusive. My last ditch action would be to flash the Bios.

 

[Marty9231]

Done that already, thanks for helping.

 

[Mark56]

Time for a new mobo, glad I could help.