Hi Taufive, Welcome to POC.
I think that board has a CPU, DRAM, VGA, Boot Device LEDs so when you boot you should see the LEDs will light up one at a time then it should make a system beep,
CPU LED will stay on if there's a fault with it.
CPU/NB frequency an HTT are abit high, i like them to be around 3x DRAM frequency up to 800Mhz=2400Mhz CPU/NB since above that you have to start throwing alot more voltage at it for not that much more performance. CPU/NB frequencyCPU/NB frequency CPU/NB frequency CPU/NB frequency
So are any of the LEDs staying lit or system not making beep?
Have you checked for bad Ram one stick at a time?
Use the MemOK but above 24pin if you have changed RAM frequency or timings from default.
Was your mobo bios upto date when you started to overcolock? Not essential but they always claim better stability with later versions. ( Be aware of the risks when flashing bios ),
(ASUSTeK Computer Inc. -Support- Drivers and Download) Just search serial number or model an download latest bios to a clean formated USB, then check mobo user guide under USB bios flashback for what to rename (ExampleBiosVersion.CAP) an place in allocated USB on rear IO (should have a bold line around corresponding USB an flashback button).
Hope this helps, will check when back from work.