I've searched the forums and net for hours, found similar sounding problems...
I bought a new computer, which arrived 2 days ago. At first, the graphics card only seemed to be working maybe 50% of the time (ie, I'd get "no signal" on the monitor for half the boots).
Ok, so when I did get a visual, I formatted and installed windows on the hard drive, no problem. Then I went to reboot..
Now the computer just stays rebooting itself after about 10 seconds. There is no display whatsoever. The keyboard lights do not flash. I'm not techy.. but I think it's not doing the POST thing (I can't tell, there is no visual at all).
The cycle it is stuck on (lasts about 15 seconds):
1 Powers on
2 CPU Fan light flashes and fans start
3 Makes a 'tick' sound(I think thats the HDD)
4 CPU Fan starts (it's a little delayed behind the others, which I read is normal)
5 Shuts down.
5 seconds later, it repeats.
What I've tried:
* Removing additional RAM modules.
* Leave the remaining RAM in the first slot.
* Triple(more even) checking that all the connections are secure.
* Removing everything unessential - I left only the CPU, 1 RAM, PSU, Keyboard.
* Tried a different Graphics Card.
* Tried no graphics card.
* Tried a different SATA HDD.
* Tried no HDD.
* Removed ALL RAM modules (this caused it to beep incessantly between each reboot cycle).
* Resetting the BIOS by removing the battery overnight, by using the internal Reset button, by shorting it.
Everything in the system is BRAND NEW, and was professionally installed. I've not overclocked anything, nor changed any bios settings from the default. I'm going to contact the seller and Gigabyte shortly, but hoped people might have suggestions in the interim.
This is almost exactly what my problem looks like:
This type of problem is often RAM related, especially with RAM that requires high voltage. Your RAM requires 2.2v to operate at its rated specs. The DDR2 standard voltage is 1.8v.
You said you tried booting with one stick of RAM in the first RAM slot. Did you also try the other stick of RAM by itself in the first RAM slot? If you can get it to boot with the other stick of RAM by itself, you should go into the BIOS and make sure the RAM speed is set at 1066MHz. The RAM timings should also manually be set to 5-5-5-15 and the voltage should be 2.2v.
Here's a checklist with additional troubleshooting ideas: