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Lost USB 2, then power to the computer

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H

highstream

PCHF Member
May 26, 2022
34
1
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#1
Win 10 Pro desktop with ASRock Z97 Extreme6 motherboard. Yesterday I lost the case's front USB 2 ports, but not the USB 3's (I didn't check the back USB 2 ports). Today, while trying to figure it out I mistook the USB 3 board connector for the 2 and moved it to another USB 3 port on the mobo and started up. The power ran momentarily then shut down, with the red power and reset lights showing. I turned off the computer's back power switch and moved the USB 3 connector back to its original spot and pressed the case's start button. No power at all. My first thought was a blown fuse, but I'm not finding one on the board or in the manual. Shouldn't there be one? Or is there something else to look at? There is power to the computer. Thanks,
 
#2
Absent a fuse, does this scenario describe what a battery failure? I've removed the graphics card but it's still tight going and I'm not seeing for sure how the battery comes out.
 
#3
Follow up: it's not the battery. The only other thing I can think of, short of the PSU having crapped out for some reason, is the Thermaltake case start button. For the past several months, pressing on its left side starts the computer then it stops, while pressing on the right starts properly. I don't see a way to get to it, certainly not easily.
 
#4
To test if the on button in the case has failed.
1) Use the ON button located on the motherboard
OR
2) remove main power
3) on motherboard disconnect lead from on button and short with a small screw driver
or
4) on motherboard swap on button lead and reset lead and press reset button to start computer
 
#5
I disconnected the AC power and tried the mobo’s power button, but no response. Same with the AC is connected What does that tell me?

It’s hard to imagine the PSU would just coincidentally go bad. But I need to know before replacing the case and tearing everything apart.
 
#6
To add: The Power LED Header on the board is empty and there’s no unconnected wire, so I’m not seeing or recalling where the case power button wire is connected. I put this together six years ago.
 
#7
Does the case have a power led ?
disconnect power from wall socket
press on button a couple of times to drain all power
connect to wall socket and turn on with button on motherboard
Test
If no go
Reset cmos - button on back of board
Clear CMOS Switch (CLRCBTN) (see p.10, No. 16) Clear CMOS Switch allows users to quickly clear the CMOS
**This function is workable only when you power of your computer and unplug the power supply.**
 
#8
PeterOz said:
Does the case have a power led ?
disconnect power from wall socket
press on button a couple of times to drain all power
connect to wall socket and turn on with button on motherboard
Test
If no go
Reset cmos - button on back of board
Clear CMOS Switch (CLRCBTN) (see p.10, No. 16) Clear CMOS Switch allows users to quickly clear the CMOS
**This function is workable only when you power of your computer and unplug the power supply.**
Click to expand...

1st test: case Power LED is not hooked up to the board plug, but there is a red light when working; don't recall where it's hooked to the board (drives?)
- disconnected power cord from wall socket (power switch on back of computer off?)
- pressed case button and mobo power button a few times to drain
- connected to wall socket and turned on power switch on back of computer
- tried mobo power button
Nothing

2nd:
- disconnected power cord from back of computer and turned off back power switch -- is that what you meant by PSU?
- pressed with screwdriver a couple of times on CMOS reset button (back of computer)
- then what? I tried mobo power button w/o connection to AC and then without
Nothing

If I've missed or misunderstood something in your instructions, I'm sorry, but to get what you're aiming at, I need full explicit step by step instructions. What you know that's unsaid, I don't, and may guess wrong. Thanks,
 
#10
I didn’t recall that the case switch cable has several connectors. I pulled it out, realized that, and then hope I got it back connected properly.

At this point, I’m not sure what to do, since the most obvious culprits are the case switch (mechanical), the PSU or the motherboard. Going back to the OP, the board’s power and reset buttons did light up at the initial failure, and it was a mistake not to have tried the power, instead of disconnecting the AC.
 
#12
No panic, just frustration at how what was working well turned to nothing and not being able to pinpoint the cause — and having to work from an iPad and rarely used old laptop in the meantime. I’m no expert, but usually with a computer, and since I built this one, I can figure things out, or at least a workaround.

Ok, No response of any kind to what you suggested. What does that tell you? To which I might add…

Thinking back to where this started functionally with the front USB2 ports… The funny thing is up to the last minute, while I discovered that a fitness watch wasn’t being recognized recently on them or then on one of the two front USB3 ports, the mouse transmitter was being recognized on the USB2…until it wasn’t. But things didn’t go totally on the fritz until I (mistakenly) moved the USB 3 board connector from one port to another. And then finally after I moved it back, which got the Power & Reset lights to go on, but then losing all response after that when I ignored those and instead disconnected and reconnected the AC power cord. No power response of any kind since then. So little seems to have caused so much…

Thanks,
 
#16
I would be removing all components from the case and re-assembling on a piece of cardboard somewhere.
forget the front panel LED's and switches, not needed, just short out the PWR SW jumpers with anything metallic to start the PC.
 
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