DUX COMPUTER DIGEST

 

Site Search

Site Info

Home » Forums » Forum Archives » Motherboards, Chipsets, Processors, & Memory » Topic # 692

K7S5A won't boot
xroyal Feb-25-02 11:56 AM
MB now re-boxed for possible RMA. Would like to try any last min "acid test" to avoid returning MB.

K7S5A - Rev 3.1, 1 gig Morgan Duron, 1-2 stick Crucial PC133, 400w PS (24A on +3/35A on +5 - Combined 190W - Listed AMD approved to XP2000+), ATI AGP, Only items hooked up except CPU fan, power sw and speaker): Won't boot.

Used heavy pressure inserting AGP (card hard againist plastic socket) and RAM (tried 1 and 2 sticks). Fans spin up, nothing else, no beeps (reversed speaker leads/no joy). Tried same config out of case on pad, same results.

Have heard hold down down reset key, no results. Admit (now) maybe had reset key leads reversed.

A little depressed at this point/welcome any input! Thanks


1. RE: K7S5A won't boot
lbyard Feb-25-02 01:01 PM
In response to message 0
>Used heavy pressure inserting AGP (card hard againist plastic socket)

I’ve had to use more pressure than I would have liked at times to insert an expansion board. Look along the side of the socket be sure the card is fully seated and inspect the back of the socket to be sure it is not broken. Sometimes an expansion board is not cut precisely by the manufacturer. I have been able to correct some them with a rasp/file. Do that at your own risk and be sure none of the dust gets into the computer or stays on the board. Some times the alignment problem is caused by a defective/cheap motherboard or a bent/cheap case. Also, you may be able to shift the motherboard so expansion boards fit better by loosening all of the screws, adjusting the motherboard position with the expansion board plugged in, and then tightening the screws (don’t over torque; make sure the computer disconnected from power). Sometimes, mainly with desktop cases, the back of the case can be bent slightly backward.

Try another display adapter.

Check the clear CMOS jumper and make sure it is in the correct position. Also, try clearing it.

Try reseating the CPU.

More steps are at http://duxcw.com/faq/mb/mb.htm. Speaker leads/plug and the reset switch do not have a polarity—they should work either way. The only front panel wires that should be plugged in when troubleshooting a “dead” (no post) motherboard is the speaker and Power-on. Larry


2. RE: K7S5A won't boot
xroyal Feb-25-02 01:31 PM
In response to message 1
LAST EDITED ON Feb-25-02 AT 01:57 PM (EST)
 
Thanks Larry! Don't have another display adaptor, did reseat CPU (pins slipped in to base very easily, locked down), did clear CMOS and return jumper to Normal (w12v MB connector pulled). Had good 9 point MB mounting, (with probably unnecessary washers between standoffs and MB). Will inspect AGP socket, and read your FAQ.

When CPU drops in slot so easily, seemingly flush to socket, does it require another push?

Seems some users had some luck holding down reset button, but doesn't seem to make any sense (assuming hooked correctly)?

Larry, Thanks for such a detailed answer!


3. RE: K7S5A won't boot
lbyard Feb-25-02 02:57 PM
In response to message 2
>unnecessary washers between standoffs and MB

Remove them. If they are insulators… You want those doughnuts on the motherboard in full contact with ground. If they are conductors, they could be shorting-out the motherboard (DC or capacitively) if the are larger than the standoffs.

>When CPU drops in slot so easily, seemingly flush to socket, does it require another push?

Not, but I press lightly on the top to keep in place when locking the latch. Be sure you are grounded when touching it (you have an anti-static strap that is grounded on or you are touching the case with your bare flesh.

>Seems some users had some luck holding down reset button

I have never heard of this. Larry


4. RE: K7S5A won't boot
xroyal Feb-25-02 03:50 PM
In response to message 3
Larry,

newegg just approved RMA on MB and chip, so I'm going to let them sort out what they sent. Will post results with new Mb. Thanks so much for your support! John


5. RE: K7S5A won't boot
copperpipe Feb-25-02 03:51 PM
In response to message 3
Larry and xroyal,

Please allow me to bleep into this conversation with additional info to Larry:

xroyal's first bootup of his system did result in a momentary post screen, "First power on fans spun up, screen popped up with system and a load of info which I ignorantly didn't pause for , instead went for delete key to get into the bios. Moment I hit "delete", system shut down.

Have done clear CMOS (1-2) with intervals of 5, 15, & 30min. Unplugged cable from case each time. In every instance, after hitting power, fans barely tried to spin, and sys shut off."

xroyal's first bootup did result in a post screen which quickly died. I was wondering if Larry could comment on these symptoms.

I've never had a bootup failure in any of my dozen or so builds, so I am not able to contribute much in solving this problem.


6. RE: K7S5A won't boot
lbyard Feb-25-02 06:02 PM
In response to message 5
Sounds to me like an intermittent short and I would suspect that the display adapter is shorting the bus, or it could be the proverbial loose screw under the motherboard. But he said motherboard did not work out of the case? I don't like the washers... “Tried same config out of case on pad.” On what pad? I hope it wasn’t antistatic pad that came with the motherboard as that pad could also be conductive. I would try the whole thing out of the case on top of the cardboard box the motherboard came in. When you all post, you have to tell me everything. I am not there… Larry

7. RE: K7S5A won't boot
xroyal Feb-25-02 06:56 PM
In response to message 6
Larry,

Can't blame you for not being a mind reader. I had all my screws, etc accounted for. Glad you mentioned using cardboard. Tons of people said use pad that came with MB, so you've taught me something else. AGP "shorting the bus" does throw me. That card and my memory worked fine in another MB the morning of the new install. Thanks, John


10. RE: K7S5A won't boot
lbyard Feb-26-02 01:16 AM
In response to message 7
>AGP "shorting the bus" does throw me.

You said you had to use a lot of force to insert it. Larry


8. RE: K7S5A won't boot
copperpipe Feb-25-02 07:19 PM
In response to message 6
Thanks Larry.

The "pad" as I recall from my K7S5A boards is merely a pink foam (packaging) material. I don't believe they are conductive although I haven't tried testing it.


9. RE: K7S5A won't boot
xroyal Feb-25-02 10:00 PM
In response to message 8
Yes Larry, I should have clarified. I used the pink foam pad that was packaged under the MB, definitely NOT the AS bag.

11. RE: K7S5A won't boot
lbyard Feb-26-02 01:24 AM
In response to message 9
Some of them are (were) conductive. Most of them are anti-static. Larry

| Home | Guides | How to | Reviews | Online Store | FAQ | Forums | Forum Archives |
| Links | News | Newsletter | About Dux | Advertising | Contact Info | Privacy |