TL;DR: I have a component that fails very infrequently, preventing my computer from POSTing (I am suspicious that this may be a motherboard issue). Since I cannot reliably reproduce this error, what would be the best way for me to find a solution to my problem?
I recently (1.5 weeks ago) assembled my first computer after purchasing all the components (PCPartPicker markup below). Everything seemed to be working perfectly until this weekend: once every 20 or so "power-ons", my PC will physically turn on (all the hardware will light up except USB devices, but I will not reach a POST beep).
- CPU: Intel Core i7-4930K 3.4GHz 6-Core Processor
- CPU Cooler: Corsair H100i 77.0 CFM Liquid CPU Cooler
- Motherboard: Gigabyte GA-X79-UP4 ATX LGA2011 Motherboard
- Memory: Corsair Vengeance 16GB (2 x 8GB) DDR3-1600 Memory
- Storage: Samsung 840 EVO 120GB 2.5" Solid State Disk
- Storage: Western Digital Caviar Black 1TB 3.5" 7200RPM Internal Hard Drive
- Video Card: EVGA GeForce GTX 780 3GB Video Card
- Case: NZXT Switch 810 (Black) ATX Full Tower Case
- Power Supply: Corsair 760W 80+ Platinum Certified Fully-Modular ATX Power Supply
- Optical Drive: Asus DRW-24B1ST/BLK/B/AS DVD/CD Writer
- Operating System: Microsoft Windows 8.1 - OEM (64-bit)
A have a few symptoms that may or may not be related:
- Occasionally (once ever 20 boots) my computer will power on, but not POST. All the hardware turns on with the exception of my USB devices, but I never even reach the screen where I can access the BIOS.
- When I render videos, there are sometimes green blocks (glitches) that appear on the screen. Could the issue lie with the Graphics card even though it performed well during stress tests?
- Also, occasionally, some of my USB devices will glitch and not work for a few moments.
- Some of the most basic OS functions will occasionally "stop responding". For example, the "Sound" function that lets you control the USB microphone input levels will always stop responding after I make a change to the settings.
Finally, when I first plugged in my video card, it did provide any signal to my second monitor through the alternate DVI slot. I had to move it to the top PCI-E slot before being able to use both ports.[Resolved - #3]
- When I booted most recently, I received an error that read "The Main BIOS is corrupted. The system will be recovered from the backup BIOS [...]" (see image below). Does this confirm a MOBO issue?
I believe that given all the problems I am having, this is a motherboard issue. However before dismantling all the components and RMA'ing this component, I'd like to confirm my suspicions.
What I Have Tried
I have stress tested each of the major components other than the motherboard:
They all passed with flying colors! However, I haven't manually tested the PSU - could the PSU be the issue?.
Further, I have done the following debugging on my own:
- Double-checked the connections throughout my setup;
- Reassembled the setup twice;
- Checked the PSU voltages - voltages look fine (see below). All other cables passed test also.
- I replaced the motherboard very recently, and about 4 days later the same boot issue occurred [Added - #6].
Essentially, I am wondering how I can appropriately debug this issue. Usually when I ask this question, I get told "take everything apart, and start putting it back together until it stops working". I can't do this because it takes about 20 - 25 power-ons for the error to occur - how will I know if it is working or if it just hasn't faulted yet?