My PC has problem starting. By starting, I mean turning power on.
Case: "CM Storm Trooper". MB: Asus Maximums VIII Extreme Bought in 2015.
I started months ago, I needed to press the power button many times (multiple times, for minutes) in order to get it started immediatly. Recently (between 1 and 2 months ago), it couldn’t start at all. I figure out that the most likely reason had to with CMOS battery. So I changed the CMOS battery. And now, after such a short time, it’s doing again … the more it goes, the longer I have to press and re-press the power button to get it started.
(By the way, there doesn’t seem to be a problem in the wall-power cord-power supply-motherboard chain, as the motherboard always has its usual leds on. Well, I’m not sure which ones are the usual, but it always had some since I own it.)
Any idea? Would there be a problem consuming the CMOS battery faster than expected?
What I have been able to do so far:
The MB has an on-board power button on it, I pressed it and the computer didn't start better than with the case power button. I guess that means the problem probably doesn't come from the case power button.
Then I shaked the case a tiny bit (I no it's not a way to treat a computer but it arranged the problems sometimes and In did it softly) ... the next time I pressed the case power button, the computer started. (No more investigastions right now because I just need to get some documents and then go places in the outside world.)
Based on anwsers/comments so far, I can also say that so far I can't identified the power button connector on the board. At first look in the manual, nothing called "POWER" or "PWR" or "POWER HEADER"At best I see "ATX power connectors" but I suspect these are linking the PSU to the MB, not the case to the MB. Later:
- BIOS is now up-to-date (had not been done for ~1 year), after a series of black screens, power offs, 'ME update' and computer resetting on its own, Windows finally started. Apparently, it didn't change anything to the boot up scarcity.
- Once again, smoothly shaking the case helped starting, but not each time.
Further testing 7/12/2018
Changed the CMOS battery again. Tested all the three batteries (the old one, the "current" one and the new one) with some very old voltmeter. All three seemed to have equal power. I don't know much about voltmeters however.
Finally found the "POWER SW" connector ... it was part of a bunch of cables coming from the top-front panel to a group of pin called something like "System panel connector". It is still unclear how the manual is describing those two pins, description and illustration don't seem to match, but the connector had the text "POWER SW" on it, it was initially turned upside down, which is the reason the I could read it (assuming it has no real up and down).
Tried to shortcut the pins as suggested. Without result.
Last time I turn the computer on, it didn't start immediately, had to press the switch a few time. But when it started it first turn off for like 1 or 2 seconds and then re-started on its own (without me pressing anything). (A bit afraid this may be bad for the hard drives.)
More details as answer to answer below.