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Pent III 600
64MB ram
Win 98SE
Trying to fix an old PC - Soon after pc starts - displays desktop and icons it reboots. Does not do this in 'safe' mode. Have reformatted hdd (20gig) and disconnected all drives cards etc everything except monitor, mouse and keyboard. Suspect motherboard problem - any sugestions?
Welcome to vdr {virtualdr}
I suggest cleaning the computer first.
Acts like the hsf is full of dust and junk to me.
Normal happening to all of us.
Never done a cleanup like that let me know and instructions can be posted.
Rebooting like that can be caused by a failing power supply. If you have, or can borrow, a multimeter, here's how to test a power supply:
Testing PSU voltages
Or alternatively you can buy a proper PSU tester, they don't cost much:
PSU Tester
Have blown out brushed and hovered inside but will check psu - take it there is extra load in normal mode and not safe mode.
HSF???????????????????
Oh OK figured that out Heat Sink Fan clean as a whistle
Quote:
take it there is extra load in normal mode and not safe mode.
Yes there is, and it can cause cpu overheating, which will casue the computer to shutdown.Quote:
Have tested voltage thru molex connector and getting 5 and 12 OK. HSF clean and am running with case open what temp should processor be at as am able to monitor that also when pc starts up.
Thanks for help btw this one has been driving me crazy all week.
CPU temp is 37C/98F CPU fan speed 4821-4963 RPM
Those are fine numbers.Quote:
Originally Posted by tpuk57
Look one the ps and post what the label says.
which info on ps?
it is a mercury 300 w atx switching power supply
input voltage 115/230v current 8a/4a frequenct 50-60hz
output +3.3/20a +5/30a +12/10a current -5/0.5a -12/0.8a +5vsb/2a
pson/green pok/grey com/return
300 watt
input voltage 115/230v current 8a/4a frequenct 50-60hz
output +3.3/20a +5/30a +12/10a current -5/0.5a -12/0.8a +5vsb/2a
You posted the right information.
I have a feeling that old ps is about to bite the dust.
Do you a possible replacement that is the same size in wattage or even bigger?
Also can you post the make and model of that computer?
Have old 250 w I can try
same input rating but 6a/4a
output +3.3/15a +5/25a +12/10a -12/0.8 -5/0.5+5vsb1a
+3.3 &5v total output 125w
PC is made by TINY Pentium III 600 with 64 mb ram win 98se with 20gb hdd
Nope tried that same problem
Having eliminated most other causes - could it be a failing motherboard or CPU?
Take tha cover off and set a house fan to blowing into the case.
Test the computer again.
Tried blowing compressed air at processor during start up, also have both sides off of case.
Am considering fine adjustment with a large hammer.
I agree, about time to look into getting a new mobo/cpu.
Kind of acting like mine did when the ide controller was going out.
Thanks for all the help - finally discovered 3 leaky capacitors (rust like marks on top) next to the power connection for the cpu fan.