where's the problem ?????

Sounds like a hardware problem and could have several causes. Most likely suspect is RAM. Swap with a known good stick or, if you have 2 or more sticks installed, try booting with only 1 stick at a time (swap sticks if needed) and see what happens.

If it's not a memory problem, inspect motherboard for deformed or leaking capacitors. Signs are bulging tops (top should be flat), bulging sides, or leaking electrolyte.

If not capacitors, try swapping out power supply.

If none of the above work, rate this answer and post results in comments.

Dalton

I would put my bet on a driver problem at this point. Since the system is starting up, beginning to load windows and then rebooting. Try these 2 simple steps:

1. Boot into DOS (either by pressing F8 and selecting "Command Prompt Only" from the boot menu or booting from a floppy disk). Do a complete scandisk and let the system remain on for 20 to 30 minutes. If nothing inadvertant happens then proceed to step 2.

2. Boot into Safe Mode. This will only load the basic drivers needed to run windows. It takes longer to get to the windows screen but have patience. If you can get to the main screen then run a couple of the windows apps (like Wordpad or the calculator). If everything runs OK then the problem is probably with a hardware driver that is causing the reboot. If so, then you will need to do some investigating. Post back here with your results.

Cheers.

RW

i got together the two answer....first what RW said, the what Dalton said and then i got my answer: the problem was a peripheral, the network card (for cable modem)....i took it off and the problem was solve....but now i got another problem....i put another network card and it does the same, so the problem is when a put a network card....what can i do??????...isnt the mother board slot for peripheral,?cause they all recognize my sound card and even the network cards (both)....but like RW said, when windows is loading the driver it gets stuck and then do the off/on...

so driver o hardware????

im gonna put the network cards in other pc to see what happen..

hi friend,i think so your prob's is not opening
os complitly ok. so first you check SMPS.SMPS
is not working properly try another smps. second
you start win98 in safe mode & install vga card again.and thaird was try another moduel of ram
like 128,256

You probably have a virus or worm on your system. Possibly Sasser. This one often causes a system to reboot. If the network isn't connected usually the problem stops. What happens if you leave the network card in the, but disconnect the LAN cable?
Visit the microsoft site and download the sasser removal tool. also read what M$ has to say about it and follow the instructions. Make a very thourough Virus scan with an up to date AV Software. Install a Adware/Spyware blocker (I use spybot Search & Destroy), run an update of it as well and scan your system, cleaning it afterwards. Run your windows update and install them all (Do that regularly or setup your system to do that automatically.

To be completely sure your system is virus free, you should put your harddisk as slave into a PC you are definitely sure is virus free and also has the av software updated. Scan and clean your disk in that other PC.

Replace mother board??

People, i think a have a clue....the thing is that the motherboard (bios?) does not support
windows to load in normal mode after a succesfull boot. That because i probe all the components
in other pc and they work perfectly (cd rom, floppy, ram, peripherals [mouse , keyboard, monitor,network and sound cards, power supply). I took the motherboard and put it in other pc with all other componets (including Hard disk, with win XP), and i get the same problem: the bios is fine, recognize all, boots...
but when its time to load windows i get a blue screen telling that : "windows close to avoid harmfull operation, restart and if this screen appears again check your disk...", but the same disk boot an load normal in other motherboard....so, what can it be, what can i do?????...and with my hard disk (with win98)
you can load it in safe mode only without problem.

Tell me before i put motherboard in the junk.....

Go back to the manufacturer's website and make sure you have the latest bios for your motherboard. Also check for hard drive compatibility with your particular board. Check and make sure that your fsb is set to what the maufacturer suggests.

Cheers.

RW

Well, if it was working perfectly and now it's not something has changed. Either you changed a setting, a new piece of hardware changed a setting or a software app (virus included) changed a setting. The only other explanation is that the motherboard went bad and I only say this because you said you installed all of the components on a different mobo and they worked.

One last thing to try. Start with only the basics (hard drive, memory and video). If you can boot up with these then add the mouse. Continue adding components one at a time until you run into a problem.

Or just dump the mobo and get a new one.

Cheers.

RW