How can i reset CMOS ???
in [Hardware]
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From: Francesco on 15 Jan 2010 09:37 First of all, sorry for my english !!! The pc can't start. Led are ON, but the pc doesn't start. The monitor is off, no signal. THe pc doesn't make any beep. I think there is a mb problem and i want to reset the CMOS setting. I try to remove the battery fro one day, but these action have no result. I try to change the position of the jumper near the battery (with pc off) but nothing change. There is anyone that has had the same problem and he has resolved it. The pc is an ACer Aspire m3640, the motherboard i think is a Foxconn (but i'm not sure) Thanks !!!!!
From: Paul on 16 Jan 2010 19:31 Francesco wrote: > First of all, sorry for my english !!! > > The pc can't start. Led are ON, but the pc doesn't start. The monitor is > off, no signal. > > THe pc doesn't make any beep. > > I think there is a mb problem and i want to reset the CMOS setting. > > I try to remove the battery fro one day, but these action have no result. > > I try to change the position of the jumper near the battery (with pc > off) but nothing change. > > There is anyone that has had the same problem and he has resolved it. > > The pc is an ACer Aspire m3640, the motherboard i think is a Foxconn > (but i'm not sure) > > Thanks !!!!! > Did you check the battery voltage ? Either replace the battery, or check the battery with a multimeter. A CR2032 should read at least 3.0V when it is new, and if the voltage drops below 2.4V it should be replaced. Also, verify that you haven't pulled loose the power switch cable leading from the front panel of the computer, to the motherboard. There are a number of cables, that plug into the PANEL header, and one pair of wires goes off to the power switch. Since you've removed the CMOS battery, with the power cord of the computer unplugged, you've already cleared the CMOS. If the computer has all power removed, and the CR2032 battery is removed as well, the CMOS settings would be lost. And that is what resetting the CMOS does as well. So you've already done it. And that is why I suggest checking the CR2032 battery voltage next, in case that battery is flat (zero volts). Some computers (but not all) will not start if the battery is dead. Paul
From: Jan Alter on 17 Jan 2010 08:52 "Paul" <nospam(a)needed.com> wrote in message news:hitlot$9at$1(a)news.eternal-september.org... > Francesco wrote: >> First of all, sorry for my english !!! >> >> The pc can't start. Led are ON, but the pc doesn't start. The monitor is >> off, no signal. >> >> THe pc doesn't make any beep. >> >> I think there is a mb problem and i want to reset the CMOS setting. >> >> I try to remove the battery fro one day, but these action have no result. >> >> I try to change the position of the jumper near the battery (with pc off) >> but nothing change. >> >> There is anyone that has had the same problem and he has resolved it. >> >> The pc is an ACer Aspire m3640, the motherboard i think is a Foxconn (but >> i'm not sure) >> >> Thanks !!!!! >> > > Did you check the battery voltage ? Either replace the battery, or > check the battery with a multimeter. A CR2032 should read at least > 3.0V when it is new, and if the voltage drops below 2.4V it should be > replaced. > > Also, verify that you haven't pulled loose the power switch cable > leading from the front panel of the computer, to the motherboard. > There are a number of cables, that plug into the PANEL header, > and one pair of wires goes off to the power switch. > > Since you've removed the CMOS battery, with the power cord of the > computer unplugged, you've already cleared the CMOS. If the > computer has all power removed, and the CR2032 battery is removed > as well, the CMOS settings would be lost. And that is what > resetting the CMOS does as well. So you've already done it. > > And that is why I suggest checking the CR2032 battery voltage > next, in case that battery is flat (zero volts). Some computers > (but not all) will not start if the battery is dead. > > Paul Consider that there is a problem with the power supply. PS's quite often can fail partially so that you can still have LEDs lit or a cpu fan running, but have other sections of the PS fail to not give enough voltage to allow the cpu, graphics, hdd, etc to function. -- Jan Alter bearpuf(a)verizon.net
From: Francesco on 25 Jan 2010 11:02 Thank you for replying !!!! >> Did you check the battery voltage ? Either replace the battery, or >> check the battery with a multimeter. A CR2032 should read at least >> 3.0V when it is new, and if the voltage drops below 2.4V it should be >> replaced. Battery checked. 3V >> Also, verify that you haven't pulled loose the power switch cable >> leading from the front panel of the computer, to the motherboard. >> There are a number of cables, that plug into the PANEL header, >> and one pair of wires goes off to the power switch. I dont' understand, probably for my bad english. There is many wires from the front panel and they are all 'linked' to the mb > Consider that there is a problem with the power supply. PS's quite often can > fail partially so that you can still have LEDs lit or a cpu fan running, but > have other sections of the PS fail to not give enough voltage to allow the > cpu, graphics, hdd, etc to function. To verify that what can i do ? Using multimeter whith the 24 pin coonection ? Thank you to all !!!!
From: Francesco on 25 Jan 2010 12:39
I have tested the voltage. The only anomaly is the voltage o f the blue cable that is -11 instead of -12V. The other voltages are major than expexted. For example 3,37 ; 5,04 ; 12,01 I try to start the pc without any video card and after removed all memory banks, but again the fan start but no beep Mother Board ? Processor ? Power supply ? i think no after last test |