asus maximus formula
6600 quad core
2x2mb corsair 800
ran fine for about a year, now out of garauntee. then one day absolutely refuses to start
except for fans etc. re-pressed power button and everything fine.
after a week or two, same problem, except now takes 3/4 starts to get up and running. but when running
then one day refuses to start at all, fans but no beep, after being off for a few hours, not a whole day.
but starts up next day when "cold".
when running examined with asus probe, all temperatures and voltages well within tolerance
eg. cpu at 35C, nb at 40, sb at 45 etc. etc..
gets progressively worse, refusing to start for days, but eventually does
(this written on another machine).
looking inside the case:
there are status led's on mb. when it boots correctly giving one beep, the hd light goes amber and
various others for north and south bridge go green.
when it refuses to start, except for fans, no hd light and all the bridge and other led's are red, amber and green.
in the mb manual this indicates "crazy" overclocking.
it is not overclocked, indeed after battery removal, several times, and cmos re-setting, the bios is at
removed all cards and cables from mb except for cpu, psu, case speaker, power button.
exactly the same symptoms.
will boot and give a beep from cold, except it's two beeps (memory not found), however try to restart it
after it has been on just for a few seconds and it refuses. wait a day and it's ok, empty mb or not.
when it does work it is absolutely fine, so i don't think it's the cpu.
i have narrowed it down to psu and or mb.
i sense that it's something like a build up of static or something electrical in the mb that needs a day or
two to dissipate, but i am probably wrong.
what is it? what might i do, if anything? except replace parts. which parts need replacing?
why is this happening? what happened?
it is not a complete failure, it is intermittant, though with some degree of predictability.
it will probably start from cold, though not every time.
it will probaly not start at all, no beeps, just fans, with all the mb "crazy" lights on, if re-started
when it has worked in the previous 24-48 hours.
also, if it is mb, is there a replacement you'd recommend, without all the maximus's, perhaps too elaborate design with cooling sinks everywhere but no fans, (which might not work as well as asus think they should)?
Don't do anything in the PSU (Power Supply Unit) if you're not qualified. Borrow one from another system or a shop to make sure it isn't the source of your issue.
You can inspect the motherboard to see if there are bulging capacitors or something else obvious, e.g., a bad colder joint, but that intermittent issue isn't caused by the northbridge or the southbridge being too hot.
Since the motherboard is under warranty, why would you buy another one, except as a temporary replacement? If you RMA the motherboard, expect a long turnaround. I sent a defective video card to Asus and the replacement is on it's way back to me after 3 weeks.