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Author Topic: Sleepy Pentium 4  (Read 1583 times)
Beeley
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« on: June 07, 2003, 11:01:06 PM »

PLEASE SUPPLY RELEVANT INFORMATION:
Operating System Version:Windows XP Home
Problem Application Name & Version:
Problem Hardware Make & Model:
Error Messages:


My computer refuses to start up. It is 18 months old, made by Novatech and has a CT-9BJA motherboard with a Pention 4 17000MHz processor. It is running Windows XP Home.

At switch-on, the keyboard lights briefly flash, the monitor comes to life with a message 'that it is going to sleep' and promptly does so.

The hard drive (Maxtor 60 Gig) access indicator light (signal from motherboard) stays on as does the CD drive light but not the DVD drive light. There are no noises from the hard drive (but it comes to life when fitted into another computer.). This is as far as the boot process goes, no beeps or anything else.The front reset and on/off buttons have no effect.I cannot get into the BIOS settings to change the boot options. The POST sequence is not completed.

All the fans are running. The BIOS Li battery indicated 3.04 volts. I have tried removing and reinserting all connectors and memory chips, tried running without the drives. All options give the same response.

The +&- 5V leads are at 4.62 Volts
The +&- 12V leads are at 10.82 Volts
The + 3.3V leads are at 4.62 Volts

The motherboard/power supply uses additional connectors to my other computers so I cannot test either by substitution. I am reluctant to buy a new motherboard, CPU and PSU to eliminate these components.

Can anyone suggest what the problem might be?

Regards,


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« Reply #1 on: June 08, 2003, 03:10:42 PM »

Hi,

Did you verify/reseat the CPU/CPU fan?

Did this simply occur one day when trying to power up the system or was there new hardware installed that may have caused this?

Did you have a thunderstorm right before this problem?

Do you actually 'see' anything on the screen, even for only a second?

Is your internal speaker connected to the motherboard?
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Beeley
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« Reply #2 on: June 10, 2003, 12:10:51 PM »

Hi
Thanks for the reply
I have tried reseating the CPU/fan
No new hardware/software has been installed
Have had no thunderstorms
The screen briefly shows a message that the computer is going to sleep
The internal speaker is not connected
The fault occured at switch on after a normal shutdown

Do you know the mechanism for sending the computer to sleep? because this seems to be the cause of the problem.
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« Reply #3 on: June 10, 2003, 03:20:57 PM »

Hi,

Can you connect the internal speaker to get the beep code?

This will tell us what to look for.
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« Reply #4 on: June 12, 2003, 08:03:58 AM »

Hi
I have connected the speaker. No beeps are heard.

Having been left for 2 days, the computer returned to life and worked normally until shut down when it went into a deep sleep again instead of switching off. (lights on, monitor off).

I have not been able to wake it up again since. I shall leave it for a couple of days to see if the problem is due to a capacitor or something holding a charge and not been able to leak away in the normal way.

Do you know the mechanism by which a computer is switched off or sent to sleep? I assume a voltage is applied somewhere. Have you any idea where I should start looking?

Thanks for your assistance.
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« Reply #5 on: June 16, 2003, 04:14:22 PM »

Hi

No joy at leaving the PC for 3 days. Have borrowed another PSU and we are back in business again.

Have you any idea how to check the power good and power on leads from the power supply. Should they have any measurable voltages on them?

Many thanks for your help

Regards, John
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« Reply #6 on: June 17, 2003, 12:36:21 PM »

Hi,

Here is an article which discusses the ATX power supply:
http://www.compute-aid.com/atxspec.html

For more details, check out page 27 of http://www.formfactors.org/developer/specs/atx/ATX_ATX12V_PS_1_1.pdf

Use at own risk!
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« Reply #7 on: June 17, 2003, 04:46:35 PM »

Hi
Thanks, I shall look at the refs. given
Regards John
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« Reply #8 on: June 17, 2003, 06:21:56 PM »

Hi,

I am assuming the new power supply fixed your problem and will close this thread. If the problem persists, let me know and I will re-open this thread! Grin

Glad you're up and running! Cool
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