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HP Pavilion 761n Will Not Boot

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Name: NC Dad
Date: November 2, 2004 at 12:50:29 Pacific
OS: WinXP Home
CPU/Ram: 1.67Ghz/512MB
Comment:

Problem:
System will not boot. Keyboard LEDs light up when initial power provided to system, then does not function after that point. Nothing appears on monitor; monitor is good, works with other systems. Floppy boot not possible since boot process doesn't get that far. Fans work. Hear a couple of beeps, maybe 3, then nothing.

Before posting, I have already isolated modem PCI card, USB add-on PCI card (for built-in USB ports in chassis front), CD-RW, DVD, floppy, HD, & stick of RAM with no change in system response.

Any assistance is appreciated. Please advise also if similar topic exists for this HP product. Thanks!

Thank you!!



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Response Number 1
Name: fordman
Date: November 2, 2004 at 13:26:28 Pacific
Reply:

Three beeps is bad. This may be of some interest to you:

http://www.computerhope.com/beep.htm

Always looking for techs:
http://www.protonic.com/volunteer.php?PHPSESSID=25e06d90d2153c5e0b49d9c798c3024d


0

Response Number 2
Name: NC Dad
Date: November 2, 2004 at 13:43:26 Pacific
Reply:

Thanks fordman! Good link. Will investigage further & compare beeps. In reviewing other trbls in this forum, I found another link on PSU tsting (http://www.ochardware.com/articles/psuvolt/psuvolt2.html) that I'll try too. A lot of good info in this forum. I'll report back what I find, probably tomorrow sometime.

Thank you!!


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Response Number 3
Name: NC Dad
Date: November 3, 2004 at 13:47:49 Pacific
Reply:

Hi all,

Here are the preliminary results of my power tests, using Fluke multimeter. I was only able to get volt measurements. Wasn't able to get any Amps. With the jumper in place, the PSU kept shutting down when I inserted the leads, using 10A & Common on Fluke. The milliAmp option didn't provide any readings & the PSU didn't shut down either. What are your thoughts? Thanks!
+++++++++
FYI:
PSU Specs -
Type: Bestec PSU/Model #: ATX-1956D (Output Rating 200W Max)
Wire Info -
Red: +5V/23A
Orange: +3.3V/10A
Yellow: +12V/12A
Black: Ground
Purple: +5VSB/2A
Gray: Power Good (?)
Blue: -12V/0.8A
+++++++++
P1 (MB Pwr Connection)
Top Row (1-10)
1 - 3.3
2 - 11.873
3&4 - jumper positions (Floppy LED on & PSU fan on)
5 - Grnd
6 - Grnd
7 - Grnd
8 - Empty
9 - 5.09
10 - 5.09
Bottom Row (1-10)
1 - 3.3
2 - 3.3
3 - Grnd
4 - 5.090
5 - Grnd
6 - 5.090
7 - Grnd
8 - 4.994
9 - 5.011
10 - 11.928

P1 Amps
Red - ? (No continuity)
Yellow - ? (Continuity Exists)
Orange - ?
Purple - ?
Blue - ?
***
P2
Red - 5.154v/? A
Yellow - 11.624v/? A
***
P3
Red - 5.154v/? A
Yellow - 11.624v/? A
***
P4
Red - 5.154v/? A
Yellow - 11.624v/? A
***
P5
Red - 5.154v/? A
Yellow - 11.624v/? A

Thank you!!


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Response Number 4
Name: NC Dad
Date: November 4, 2004 at 09:09:53 Pacific
Reply:

Hi all,

I purchased a new PSU today. After connecting only MB, HDD, & floppy, I turned new PSU on and MB did not boot. Situation still the same. Any other additional thoughts?

Also, I'm not getting any POST beeps. I hear a soft click, maybe HDD or CPU activity? However, it's pretty quiet now.

Thank you!!



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Response Number 5
Name: NC Dad
Date: November 4, 2004 at 09:15:10 Pacific
Reply:

In addition, MB seems to be routing power. The CPU fan is operational as well as the secondary case fan.

Could this be a CMOS battery trouble?

Thank you!!


0

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