my PC seems to have a problem, never boots until i clear CMOS..

garyfl

garyfl

garyfl

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26 Jun 2010
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west yorkshire.
As it says in the title, im having this problem recently where when i wake up on a morning and turn on the pc it keeps doing this cycle thing where lights come on, cathode flashes, ram light on, mobo light on, (ud7) no cpu light for some reason.. and after 2 seconds turns off and repeats.. no post.

ive made sure every cable its attatched properly ( currently at girlfriends and the pc got transported 15 miles in the car) unplugged power cable etc, only thing that makes the pc boot up is by pressing clearing cmos, its so hard to explain, i thought it would have been the temperature of the house as its around 15.c in the morning ahha, i opened case today and took ram out and placed it back in, also made sure all cables were fully in, it DID boot fine this time, first time too BUT it isnt the morning, i guess the real test is in the morning, just wondered if anyone has come across this problem ? damaged parts ? power supply ? temperature ? im not so sure, any input ? seems removal of cmos battery/clearing cmos is only remedy so far.
 
The only time cold would effect it, is if you had it in a room/ place below the dew point and condensation would effect it.

Most probably a loose connection or shorting wire :)
 
but if i was to lets say clear cmos after me getting bored of 4 cycles of failed posting it would just work, also is it important to note, first time i booted up after bringing it here i got a failed check sum error, what does that mean ?
 
im kinda scared all together the studio pc cost me little over £1800 so hope its not been damaged in transit, the power supply is a powercool 950 watt so im dubious and think its that, i just dont know much about these things, but the checksum error screen didnt look particularly normal
 
Checksum error = your biggest clue and probably why you are getting a refusal to boot from time to time

check the seating of the MB battery. About the size of a 10p piece on your motherboard somewhere. It has either dislodged slightly in transit (most likely) or needs replacing (most unlikely)

:)
 
I had a similar problem with a Gigabyte MB until I turned off "Legacy USB" device support in the bios. It turned out that the problem was caused when my ipod classic was docked when the machine tried to boot.

Unlikely to be the same problem for you, but thought I'd mention it :)
 
Essexraptor said:
Checksum error = your biggest clue and probably why you are getting a refusal to boot from time to time

check the seating of the MB battery. About the size of a 10p piece on your motherboard somewhere. It has either dislodged slightly in transit (most likely) or needs replacing (most unlikely)

:)
Click to expand...

when i first got here, first thing i did after 5 failed cycled posts was disconnect EVERYTHING from the back and front, and check all connections were firmly in, i even took out the ram and placed back in, i took out the battery and placed back in, thats when i got another checksum error, you reckon i just placed it back in wrong ? 2nd time unlucky ? after clearing cmos and it boots, everything is perfect system wise.
 
right, taken out the battery, placed back in as neatly as i could, booted fist time, fingers crossed :)
 
nope. failed to boot first thing this morning. NOW im worried. no checksum error or anything, just failed cycles where it turns on, turns off.
 
Is the bios chip fully seated (or it may be a soldered chip)?

Poor intermittant earthing on the PSU, check at plug and at fixings to case.

andy.
 
nkata said:
Is the bios chip fully seated (or it may be a soldered chip)?

Poor intermittant earthing on the PSU, check at plug and at fixings to case.

andy.
Click to expand...


everything is fine, it only works after i press the clear cmos button on the back of case. otherwise, no boot on a morning.
 
I thought a checksum errors were to do with the configuration stored in memory not fitting/or being consistent with the actual configuration or something like that.

I had one recently, I had to reset the bios, then change some of the settings like memory voltage, to what they were before(luckily I remembered).
 
yeah everything is at stock, i dont get a check sum error now, it just fails to completely boot in the morning.

ive even gone to the trouble earlier of pulling the plug so it goes off, waiting for lights to die out then plugging it in then pressing on, boots straight away.

its only in the morning im having trouble or when i leave it a very long time, when i get it to boot in the morning after clearing cmos the temps on cpu are as low as 19.c
 
I had much the same problem for a while which came completely out of the blue. Moving my two sticks of RAM into their adjacent slots sorted it out. I have no idea why!
 
its just puzzling me so much i cant for the life of me diagnose what the problem could be as im not a certified techie or anything i just have a general idea. wyhen the system finally boots i couldnt fault it, no loss of speed or anything its just that initial boot on a morning, whether its to do with the cold or the cmos battery looses info after being off so long i do not know, once its booted and on i can pull plug and restart straight away, its just when its off for a few hours or when ive left it off overnight. heating isnt on overnight. someone mentioned dewpoint but even with heating off i dont think it could reach that point, even so, if it was related to temperature, how come i clear cmos and 'it just works'. thats the puzzling question.
 
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