 | |
Boot Problem: Mobo/Power?
Miscellaneous PC Hardware Miscellaneous PC hardware topics (comp.sys.ibm.pc.hardware.misc)
 |
| | Thread Tools | Search this Thread | Display Modes |
#11
 
| ||||
| ||||
|
Re: Boot Problem: Mobo/Power? -
02-05-2007
, 08:47 PM
|
hows the temps? |
Paul wrote:
Quote:
|
Between the DIMM slots, and the main power connector, is the Standby Power Indicator LED. When the PSU is switched on at the back, the LED should light, and it should not wink or blink. |
RussellS wrote:
Quote:
|
Jim, What memory do you have installed? http://www.intel.com/products/mother...ddr2/index.htm. |
mention that the system has been working for several
months and just started doing this recycling behavior.
Good question, though.
DaveW wrote:
Quote:
|
The only way to tell which is bad is to install a known working PSU and see if that fixes it. (Much easier than first replacing the motherboard.) |
--
Jim Garrison (jhg (AT) acm (DOT) org)
PGP Keys at http://www.jhmg.net RSA 0x04B73B7F DH 0x70738D88
#12
| |||
| |||
|
#13
| |||
| |||
|
|
Thanks much to all of you who responded to my question. JAD wrote: hows the temps? This happens starting from a cold system. |
heat if... lets say the heat sink was bumped loose or improperly installed
to start.
Quote:
|
Paul wrote: Between the DIMM slots, and the main power connector, is the Standby Power Indicator LED. When the PSU is switched on at the back, the LED should light, and it should not wink or blink. Solid as a rock RussellS wrote: Jim, What memory do you have installed? http://www.intel.com/products/mother...ddr2/index.htm. Kingston KVR667D2N5K2/2G (1.8v DDR2-667). I forgot to mention that the system has been working for several months and just started doing this recycling behavior. Good question, though. DaveW wrote: The only way to tell which is bad is to install a known working PSU and see if that fixes it. (Much easier than first replacing the motherboard.) I guess I'll have to go buy a power supply.... :-( -- Jim Garrison (jhg (AT) acm (DOT) org) PGP Keys at http://www.jhmg.net RSA 0x04B73B7F DH 0x70738D88 |
#14
| |||
| |||
|
|
OK, I measured the voltages on the PSU connector with /PS_ON shorted to ground. I used the pinout chart at http://pinouts.ru/Power/atx_v2_pinout.shtml for reference, and found one potential bad voltage: Pin 14 should be -12, but on my PSU it's -10.5. Is that enough to cause the observed behavior? |
know of is for the serial interface. There everyting between -5V
and -15V is acceptable.
Arno
Quote:
|
Everything else is within 2% of spec (3.3v reads 3.35, 12v reads 12.25, 5v reads 5.01 or 4.99). -- Jim Garrison (jhg (AT) acm (DOT) org) PGP Keys at http://www.jhmg.net RSA 0x04B73B7F DH 0x70738D88 |
#15
| |||
| |||
|
#16
| |||
| |||
|
|
It was the power supply. I bought another one, put it in, and it booted fine. Looks stable now. Thanks for all the input and information. |
this feedback here.
PSUs are perhaps the most overlooked critical component today.
Arno
#17
| |||
| |||
|
|
In comp.sys.ibm.pc.hardware.misc Jim Garrison <jhg (AT) acm (DOT) org> wrote: It was the power supply. I bought another one, put it in, and it booted fine. Looks stable now. Thanks for all the input and information. Congratulations on getting it to work again. And thanks for posting this feedback here. PSUs are perhaps the most overlooked critical component today. |
able to diagnose a power-supply problem from unloaded voltage
readings. Other than the -12v being a little low, all
other voltages were right on.
|
« Previous Thread
|
Next Thread »
| Thread Tools | Search this Thread |
| Display Modes | |
Linear Mode
| |
Powered by vBulletin Version 3.5.3
Copyright ©2000 - 2008, Jelsoft Enterprises Ltd.
Copyright ©2000 - 2008, Jelsoft Enterprises Ltd.