New build crashes when I plug in USB

Hi folks,

I am in the process of putting together a new build and I seem to have hit a wall. The first time I put it together, I wasn't able to get it to POST; instead, when I hit the power button the fans would spin for a moment and the case lights would flash, then nothing. The MOBO system speaker made no beeps or noises whatsoever. I proceeded to disassemble the PC and breadboard it in order to eliminate the possibility of a short. Lo and behold, it POSTed flawlessly! Pleased, I built it all back up again inside the case and POSTed on the first try.

However, when I began installing the OS, I tried to plug something into one of the USB ports on the front of my Antec 900 case. This caused the PC to crash instantly. When I tried to boot, I ran into exactly the same behavior that I saw before: a quick spin of the fans and flash of the case lights, then nothing. Again, no beeps from the system speaker.

What is going on here? Is this an issue with the case (perhaps poor grounding of the front panel?), or does this have something to do with the motherboard?

For your perusal, my hardware is below:

Motherboard: ASUS M4A88TD-V EVO/USB3
CPU: AMD Phenom II X4 965
Memory: G.Skill DDR3-1600 PC3-12800 4096MBx2
Power: Corsair TX650W Power Supply
GPU: Sapphire Radeon HD6870 1GB GDDR5 PCI-E
Case: Antec 900
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More about build crashes plug
  1. If it's anything else than a flash stick don't try to connect it when the PC is running. Remove the BIOS battery on the mobo for a while and put it back.

    Set in the BIOS the RAM voltage to the one specified by the manufacturer. If it's 1.5 leave it on auto if it's 1.6 or 1.65V set it manually.
  2. Thanks for responding. Unfortunately, resetting the battery didn't do the trick. Because there's no POST, I can't get in the BIOS to mess with anything. Back to square one. Any other thoughts?

    I'll also add that I've gone through the Tom's Hardware laundry list of common problems/fixes ( What might be going on here?
  3. Can you borrow a PSU and test with it?
  4. I don't have access to another PSU, unfortunately.

    Curious to see if it would fix my problem (at least temporarily), I rebuilt the PC from the ground up (again). Just like last time, this fixed the problem - I got a clean boot with no problems whatsoever. I decided to forego the front panel USB altogether - I left the connector unconnected - just to be cautious.

    Given that everything *appears* to be working, should I just let sleeping dogs lie? I'm still rather wary, given how strange the initial problem was. Any thoughts?
  5. The back USB ports are good? Might be the case.
  6. Indeed it is. The back ports work just fine -- it's only the front port that caused a problem. I've spent the day getting drivers installed and everything up to speed, and now that everything is up and running, I am reluctant to try plugging something into the front port for fear of another short/crash. On one hand, the system is working beautifully right now, and I'd rather not mess with something if I don't have to. On the other hand, I should probably investigate it further to see if this is some sort of systemic problem. (I'd much prefer to discover such a problem now, while I'm still under the RMA.) Any advice?
  7. Best answer
  8. Best answer selected by cdva47.
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