Help problem solving PC that won't boot please

Test memory, as in booting up with one stick at a time in place, or is there a software stress test?
Meanwhile let me check the bios versions.
No I didn't reseat the cables from the front panel, should have thought of that. I will do that.
Yes to USB hub it's part of the Dell monitor, also there are 2 USB items permanently connected, headphones and printer, the printer is nearly always powered off (at the wall). It doesn't seem to matter if either are plugged in or not to this problem.
 
Memory test as in software stress test or running with one stick at a time?
Bios is not up to date, I have just checked and will do that now and re-seat cables from front panel and see if I can get to the front panel header connections.
 
Plec, if you are still listening, I have a the latest bios cap file on a USB stick now, is that all I need before I close down the PC?
I haven't updated a bios for many years now.
 
No I didn't, but it is too late now, bios is updated to a version released 26/4/2018.
It went smoothly and rebooted afterwards.
Sorry about the panic questions, I always get nervous with this sort of thing, even TV firmware upgrades, always wondering will it come back, which of course it always does :))
 
I am going to close down and check front panel and wiring to mobo now. I will be a while, it is a little awkward for me - it's all under the desk and I am a paraplegic in a wheelchair, albeit a fairly mobile one.
 
OK to the test for a few days, sounds good. The front panel wiring and connection to mobo seem OK. Going to leave the side off for a few days now, is that OK?
I always found with the X99, it would never boot with my Sony A6300 camera attached to USB but that is the only device that showed a problem.
When I checked the Bios on Asus X99 drivers & tools, there were several other software updates for things like USB or SATA, only when you selected the OS though. Is it worth applying the USB patch?
What is the general view with updates these days, back in the 90s it was always only update if you had a problem? Since Windows 10 and this and previous build I haven't had to troubleshoot anything so am out of practice completely. Your help has been very much appreciated.
 
I had trouble with the front panel as I could only get the top free, so only had a look at the wires and felt them with a finger, seemed firm.
 
So that is it now then, wait and see how it goes? Reconnect the hub then.
I will report back in a few days if there are no issues just to let you know. Thanks again.
 
Ok, still having problems but since the bios update it's changed.
It still doesn't boot up to the bios screen but it does stay powered on. All fans are running, the mobo led code shows 00, perhaps more interesting, the CPU led on the mobo flashes on for a second off for 12 seconds, this cycle repeats until I hold the power switch to power off.
Sometimes it boots, I can tell instantly when it will because the led codes cycle instantly and rapidly through various codes.
I now have no USB devices except the keyboard widget and that is now directly off the mobo via a USB extension, it used to be on front panel USB2. I have been powering up using the mobo switch rather than case but haven't disconnected the front panel switch,audio or USB 2 & 3 cables from the mobo. I was going to try this but spotted the CPU led and thought this significant.
What do you think Plec?
 
Sorry no I thought the bios update implied clearing CMOS. I didn't reapply my settings as there wasn't anything to do. I generally only reset boot order anyway. I don't use any of the clocking settings.
Can I clear CMOS without powering up? Is there a jumper maybe?
 
Okay I have reset CMOS. PC on but not booting. I can unplug case (front panel) leads if required, it might be awkward getting them back but if needs be that is what I have to do
 
I at least have found the hard copy of the mobo guide now.
Is this beginning to sound like mobo fault or is it still too early.
Btw, I ran the windows memory test yesterday during an idle 20 mins. It found no problem.
 
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