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Posted 14 March 2017 - 06:17 AM
Posted 14 March 2017 - 11:33 AM
By the sounds of it, the most likely candidates are the motherboard or power supply. Corrupted CMOS - possible, but usually when that is the culprit the PC will still power on, but not do anything else (just sit there with the fans running, and no screen output). Personally, I'd dismantle the PC, remove the motherboard from the case, and check for any visible damage to it (scratches, any sign of a burnt track etc.) and if nothing visible, reset the CMOS and attempt to get it to power on outside of the case (rest it on a non conductive surface e.g. anti static bag it was supplied in) with just the bare minimum components installed - 1 RAM stick, integrated GPU if applicable, keyboard, but no drives or anything else. This rules out the possibility of anything on the case shorting the motherboard.
Power supply, the fact it turns on is encouraging. As you said, under no load is a different story from under load though. I have had a situation where a system would power on but wouldn't complete POST or do much else - on opening the case the slow running of the case fans and GPU fans was a giveaway that it was power related though. The fact it's not turning on at all doesn't rule out the power supply though, and the easiest way to rule it out entirely is to try another one.
Also I guess it's a typo or mistake copying info from somewhere but the I5-3550 CPU and Gigabyte H170-HD3 are not compatible at the CPU socket level. That CPU code is for an older Ivy Bridge CPU (Socket 1155) while the mobo is for Skylake generation (Skt 1151) processors
Posted 14 March 2017 - 11:36 AM
Posted 14 March 2017 - 02:28 PM
Posted 14 March 2017 - 02:39 PM
Posted 17 March 2017 - 05:37 PM
Most would disconnect as much as possible, eliminating all but PSU and mainboard, and one stick of RAM (alternate, in case first stick is bad) in required slot...
(DIsconnect power and SATA connections to drives, remove GPU, etc....; if your CPU does not support integrated video, you should at least get error codes/beeps to reflect no GPU found))
If unit still won't power on, at some point you will need either a known good PSU to try your rig with, or, test your PSU in another known good rig. (PSU 'testers' might identify completely dead units, but, otherwise are useless for lack of any real load on PSU)
Asus Z270A Prime/7700K/32 GB DDR4-3200/GTX1060
Posted 17 March 2017 - 06:59 PM
my USB ports are presumably still getting power, would this happen even with a dead motherboard?
Yes, it could. Mobo's are extremely complicated, and one area may still get power, although another is dead. One thing I might suggest for future reference is to get yourself a power supply tester. The paper clip method is great for checking if there is continuity, but useless for verifying that each rail is getting proper voltages, especially the CPU.
If you are not getting POST on the screen, you have a low-level equipment failure. That only can be caused by one of 4 things: a failed or corrupted BIOS/CMOS, a failed power supply, a failed CPU, a failed motherboard, and (on rare occasion), totally failed memory chips. The two most common things I have experienced are power supplys and motherboards.
Help Requests: If there is no reply after 3 days I remove the thread from my answer list. For further help PM me.
Posted 17 March 2017 - 07:38 PM
Thanks for the replies guys, I ended up disconnecting everything like the GPU and ram and still nothing was happening. I then took it to a technician friends' place and he had a PSU tester and extra PSU, and on testing it seemed like I was getting steady voltage so we tried the spare PSU to make sure and still no response. We were fairly certain at that point that it was dead mobo so I ended up taking my old one back and sending it off as a warranty claim, but bought a newer overclockable one anyway. I put everything back together with the new motherboard and all is fine now.
It has definitely made me keen to learn more about the hardware side of things and get a few tools that will help diagnose problems like this in the future. Thanks again for all the help
Posted 18 March 2017 - 12:58 AM
Good to hear you got to the bottom of it Consumer protection varies by country but I think they would have to have evidence there was user or installation error involved in the boards problems in order to deny a claim. They can't just deny it because it's a self build.
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