motherboard

[sarahjg]

hi there, .

system: pentium3 1GHz
512 ram, (2 x 256, synch 133mhz)
motherboard (original)not sure what make as in chinese(socket370)
" " replacement mx3w pro socket370 intel 810 1/0shield

i am at wits end. my pc has no beep no video
i took it to a reputable local tech he sugested that mother board was gone so i have purchased one and to no avail same problems. monitor is sound.

have tried the ram reseating and still nothing help

[ski]

Install/connect only the power supply, MB, CPU, memory, video card, monitor, keyboard, case speaker, and power button, and make sure the power supply's voltage selector switch is set to the correct voltage and the PS connection to the MB is securely seated.

If there's no display, then clear CMOS with a MB jumper(see MB's documentation), or by removing the CMOS battery for at least 30 minutes.
If that's already been done, then make sure the 'Clear CMOS' MB jumper is not in the 'Clear' position.
If the jumper is in the proper position, then check the CMOS battery for the correct voltage(3V).

If no luck, then place the MB on a piece of cardboard. If there's now a display, then the MB is shorting out when installed in the case. Check for a loose screw, standoff, etc., inside the case, and also remove any standoffs which do not line up with MB holes. If none is found, then remove all MB screws and metal standoffs, and install paper washers(manila folder paper works good for this) between the MB and the screws/standoffs.

If there's no display with the MB placed on a piece of cardboard, then proceed with the following:

(1)If the MB standby LED does not light up when you turn on the power supply's switch, then check the wall outlet, surge arrestor, and power cord for the correct voltage.

(2)If the voltages are ok for the items in (1) and the MB standby LED still does not light up, then then slightly raise the PS main power connector out of the MB connector a little. If the MB LED lights up, then the connector on either the PS or the MB is bad. If the MB light still does not come on, then the PS or MB is bad. Swap these 2 items out to find which one is bad.

(3)If MB light comes on, but the PS fan, other fans, and other lights do not work when the 'Power On' button is pushed, then make sure the computer case power button's wires are securely connected to the correct MB terminal(POW-ON, Power On, etc.), and that the wires are not shorting out(bare spots). If that's ok, then remove the power button's wires from the terminal, and momentarily short out the MB terminals with a screwdriver. If the fans and lights now work, then the 'Power On' button assembly is bad.

(4)If the fans connected to the MB and all other lights do not work when either the 'Power On' button is pushed or the MB 'Power On' terminals are shorted, then the MB or PS is bad. Swap them out.

(5)If all fans and lights work when the 'Power On' button is pushed but there's no display, then test the PS as described here:
http://www.ochardware.com/articles/psuvolt/psuvolt2.html
If you do not have a voltmeter, then try a different PS.

(6)If the PS voltages are ok or there's no display with a different PS, then make sure the correct memory type is being used, install the memory modules one at a time in different slots, and make sure the video card is firmly seated(some video cards need an extra firm push to seat properly).
If still no display, then swap out the MB, CPU, memory, and video card to find out which one is defective.

[sarahjg]

i have tried all sorts, the tower powers up, with internal led on, fans spinning, (have tried three diff hdd and all power up and seem to do work), have changed small battery. i am not to sure on jumpers on mb, (sugest info)

have switched between different cpu I,II,III,
is the new mb 100% compatable as both are 370socket? i am not sure power supply is an issue, apart from on new mb has less pins for hdd led, speaker, pwr led, reset and pwr switch. the previous 2 buttons are opposite functions and cant power up unless set up as so.

have tried cardboard, and it makes no diff, i have no video card or agp slot.

any more suggestions

appreciate time
regards

[ski]

The MB has a built in video adapter, so that's probably not the cause.
Remove the RAM, clean its contacts with a soft eraser, and reinstall it.
If no luck and the CPU's are known to work, then either the RAM or the power supply may be bad.

[sarahjg]

thanks for advice, but i still have no success, everything is operating in tower apart from case speaker, hence no beep sequence. but hdd is working as can hear boot process.
all jumpers are correct, can i test my monitors on my laptop, if so how?

[ski]

Hmmm...you said that your monitor was 'sound'.
Anyway, you should be able to test it by connecting it to your laptop as follows:
http://www.computerhope.com/issues/ch000801.htm

If it works, then the PS or the RAM may be the cause.