I am installing a new motherboard a Tyan Trinity 1590 baby AT. It has
AMD 366mh CPU. I have followed the manual on the option settings and
have checked all seem ok.

When I power up I get no video no speaker beep, but I have power to my
Hard drive and CD Rom and the fan on my CPU is running.

I have disconnected all ov my boards and IDE connections and still
nothing.

Short of a bad motherboard or BIOS is there anything I can check to get
this thing going.

On my old 100mz pentium motherboard power supply works fine.

My power supply shows out puts of -5v -12 +5v and +12v. My CPU says it
runs at 3.3v. Could this be a problem.

Thanks in advance


Dick Hartle
Daly City Ca.

Originally posted by franh:
I am installing a new motherboard a Tyan Trinity 1590 baby AT. It has
AMD 366mh CPU. I have followed the manual on the option settings and
have checked all seem ok.

When I power up I get no video no speaker beep, but I have power to my
Hard drive and CD Rom and the fan on my CPU is running.

I have disconnected all ov my boards and IDE connections and still
nothing.

Short of a bad motherboard or BIOS is there anything I can check to get
this thing going.

On my old 100mz pentium motherboard power supply works fine.

My power supply shows out puts of -5v -12 +5v and +12v. My CPU says it
runs at 3.3v. Could this be a problem.

Thanks in advance


Dick Hartle
Daly City Ca.

hey dick it seems to me your new mobo isnt grounded properly these are some of the common symtoms assosiated with this problem try using rubber washers to increase the space between the metal and your board... then check to to see if your internal speaker is connected....... then try just the video card leave all other slots open if it a pci video card I would use the slot closes to the agp port........

"My power supply shows out puts of -5v -12 +5v and +12v. My CPU says it
runs at 3.3v. Could this be a problem."

im not sure what you are asking here......are you talking about voltage to the proccessor. if you r and you have a switch setting leave it at exactly what the manual sayz you dont want to give your proccesor more juice than it can handle!lets just say its not recommended and definately do a final check on jumper settings and and connection to devices....
http://www.PCGuide.com/ubb/biggrin.gif

Thanks for the reply to my post. I will check into the grounding
of the motherboard.

I have advanced a little farther in my quest, my speaker was
not conected correct it now beeps when computer is turned on.

I have no boards in the system and get multible beep, but when
I try to install my vidio card I no longer get any beeps and
nothing happens when put power to the system. I have tried
two different vidio cards and same results. these cards are
older ISA trident 100mz and Dimond multimedia 200mz cards
If I don't find anything else I will pick up a PCI card and
see if that makes any difference.

About the voltage was my output voltage of my power supply
is -5v -12 and +5v +12v is this the correct output for newer
motherboards because my CPU is set to run at 3.3v

Thanks again for all your help.


Dick Hartle
Daly City CA.

I'll go with the grounding problem, sounds like a good bet to me. One way to find out is to take the entire thing out of the case, and try it on a table with motherboard, CPU, power supply, memory, video card, and keyboard. Oh, and a monitor...and make sure you turn the monitor on, I tried to figure one out for an hour once until someone else walked over and turned the monitor on...No floppy or hard drive needed, you only have to boot far enough to see a picture. If it works on the table, and not in the case, you have a ground problem. Check with computer shops, they have washers for that problem. I usually assemble the entire system on the table first, that way I know it all works before I put anything in a case. But then I have power supplies, video cards, floppy drives etc lying around here for testing purposes. Not everyone has all that around the house...I've even been known to install Windows with the thing scattered around on a table...Speakers and all...lol

About the voltage...

The voltages you posted are typical for power supplies, that's the usual voltages used for most motherboards. The motherboard has a jumper setting that routes the current through a voltage reducing circuit for the CPU. This jumper setting must be set correctly for the CPU you are using. As long as you have everything on the board set correctly for your CPU it should be no problem. That and the main power supply plugs are the things I always triple check when I set up a system. Everything else can be botched and then fixed, but if the voltage is wrong, you can fry a CPU or motherboard in a hurry.

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