hi everyone. as of lately ive been experiencing this reboot problem that ive noticed a lot of other users on this forum have problems with. yes, my computer reboots by itself, and ive went as far as to do virus scan with AVG, spyware scan with like 5 programs, and all comes to no avail. there are no viruses or spyware found on my computer. when the comp reboots, all is fine, there are no error messages that pop up.
i built this machine like a month ago, but reformatted last week so this problem is rather fairly new to me. it first happened when i came back from work and started working on the computer. i had been downloading something (this has nothing to do with the problem) and then after like 2 minutes of me using the computer, it restarts. this was from leaving the comp on overnight. the next day it did it again after about 3 hours into run-time. today it had restarted on its own, again. in these instances, no intense applications were running....just basically idle.
i looked around this forum and got the idea to check EVENT VIEWER, and i found the messages when my computer restarts. SOURCE: SAVE DUMP. properties say,
"The computer has rebooted from a bugcheck. The bugcheck was: 0x1000007f (0x00000008, 0x80042000, 0x00000000, 0x00000000). A dump was saved in: C:\WINDOWS\Minidump\Mini020204-01.dmp."

i then proceeded to uncheck auto restart when system failure. today it rebooted again (this is the 4th or 5th instance total) even after i unchecked auto restart. i assume this means i have a hardware issue.

i believe this is RAM problem?

i check my voltages, rails are fine, they never fluctuate like some bad psus do. mobo temps are at 21 under load, cpu temps at 36 idle 41 load.
case is clean; no conflicted drivers in device manager....

heres my setup:
asus a7n8x rev2.0 (1006)
amd 2500+barton (stock hsf)
enermax eg301pvb 300 watt psu (very stable)
corsair 2x256mb 3200 DDR value select (run in dual channel)
radeon 9600se
maxtor 80gig
sb audigy 2zs
philips cdrw
XP PRO

i seriously think my ram has become faulty. i recently had my comp overclocked and was in the process of reaching max fsb. the first day that it rebooted was when my settings were at 202 fsb x 10.5. memory was at agressive and timings were 2.5 3 3 8 all stock voltages, then i decided to change everything to stock, with 166x11 and 2.5 3 3 8, everything set on optimal. but the reboot problems persists....
ive had my specs at 200x10.5 for awhile and it was stable as a rock with benchmarks and all, so i dont know if its the extra 2 mhz that screwed stuff up or what....

any help would be appreciated. in the best scenario, my ram is faulty, then i can just take advantage of the corsair lifetime warranty. hopefully you extremely helpful guys can pinpoint this to one suspect. thanks.

I have the same problem with one of my computers and thought that it could be the ram, i mean it makes since right? Well that didnt help me at all. I mean now its running fine again, but it did that when the other ram was in it too. Sometimes it goes sometimes it just restarts so i dont think its a ram problem. However every problem is different i would try it if i were you, but i dont think it will work for you.

something to look at.
Asus added a new function since A7V133 BIOS version 1005. This function allows the BIOS to check the fan speed during the POST. If the CPU fan speed cannot be detected or is lower than 2000rpm, the system will be shut down with a long beep automatically to avoid CPU from overheating. So please check whether the CPU fan is well connected with the CPU_FAN pin on the motherboard and works properly. If you wish to disable this function, please enter the "Power" menu in BIOS setup and set "Fan check beeping" to [Disable].

please check this on you system.

i haven't been able to figure out asus numbering system yet. so i don't know if your board (a7n8x) is before or after (A7V133) so you'll need to check your ststem (in BIOS) to see if you have this setting.

hello kingjon. it seems you misunderstood what i had said. i believe i have a newer board than the a7v133 (ive never heard of that before),is that with a 266 fsb? if it is then that is pretty ancient i assume. my mobo has smart fan feature which auto adjusts fan speed according to temps, kind of how thermal-controlled fans work. and for the sake of it, my cpu is not connected to the headers which allow thermal control-- cpu fan is constant speed and thats how it should be.
i guess my long post was worthless since i failed to make the point that temperatures, voltages, and software is fine....

in any case, i havent experienced any more reboots, and i am running stock speeds now. i will see how the situation matures...thanks.

Overclocking can cause the CPU to throw fits and other components in the board that are being run over their rating. 41 degrees is running a little bit on the high end of temperatures, you might want to consider some extra ventilation fan, look into a bigger heatsink, or better heatsink design/materials. I personally feel uncomfortable with temperatures over 36 degrees as degradation accelerates rapidly as temperature climbs.

sungmin,
my post was to bring to your attention that after that model number they add this to the motherboard and it should be checked out. i aggree with jamming that you are having heat trouble.

hey kingjon, its been a couple days since i reformated, and there have been no reboots. i figured the problem was that i ran my FSB too high for the memory to handle, therefore it randomly rebooted.
as for temperatures--AMD considers 55C as approaching a heat problem. im nowhere near that. as of now im running 200x11 which is 3200+ speeds with 1.77 voltage, so its hotter than its ever been, but my temps dont ever go above 47. im not worried at all about heat problems. thanks for the concern, though.

it is good to hear that things are back to normal for you.

i realize this is an old solved topic now but i was just looking through and noticed that i had similar problems. i too had an asus mobo but the bios version never had such a setting for everything to turn off at high temps. my temps usully run relatively high however. in the upper forties and mid fifties. i just bough a new mobo. its a soyo kt600 dragon plus. its a bit of a step down but i really am desperate to fix this fix. now my machine wont even start up however. i stripped everything down to just the motherboard, one 512 stick of ram the harddrive and graphics card (no onboard display) and the machine just starts up for a second with no video and cuts off with a long high pitched tone. i switched out the cpu with a 1700 and another 2500 and they all do the same thing. i tried all the options for fsb jumpers and still nothing. what could be the problem?

Could be a bad CPU or bad Memory. Or memory that doesn't work with that board.

quick and easy way to test ram here:

http://www.memtest86.com/