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Intel PC Constantly Rebooting

By IREChe ·
I'm building an Intel PIII machine with 256MB, 20GB drive etc. I have also put in a 32MB AGP Graphics card.

Problem: Everytime I try to install an OS to the system the computer reboots.

So far I have tried changing every piece of hardward individually. Have changed to graphics card for a brand new card of the same spec. Have changed the memory chips being used. Have changed the power box in case it was a dodgy power supply. Have changed the motherboard and the hard drive. Have also tried changing the processor and heat sink. It seems like I have changed everything so far that I can think of. I've practically changed the whole machine. It seems to reboot when it starts to load the GUI. I've tried loading both Linux and Windows and at exactly the same point the system reboots. From then on it will reboot after the POST test.

Any suggestions would be greatly appreciated. Tearing my hair out at this stage.

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Intel PC Constantly Rebooting

by IREChe In reply to Intel PC Constantly Reboo ...

There is no current Windows version on the machine. Nothing has been loaded. Tried loading a couple of OS's. Win2K, Mill, Win98 and Red Hat Linux. Just as the GUI interface is about to start the machine reboots. Have changed the chassi and the power box. It is currently working off of a 250 watt power box but previously tried a couple of 300watt boxes. Exactly the same thing happened each time.

Exact configuration of machine as it currently stands.

20GB HD
256MB Ram (2 DIMMS)
32MB AGP Graphics
Shuttle PIII Motherboard (AV18E) (Most recent BIOS loaded)
52X CDROM
3.5" Floppy Drive
250Watt Power supply.

Some additional info.....I can boot using a floppy disk and can get to a DOS prompt but as soon as I try to run a setup or fdisk or format the HD the machine will reboot.

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Intel PC Constantly Rebooting

by Shanghai Sam In reply to Intel PC Constantly Reboo ...

I agree with chas. It sounds like a very similar situation on my older PC. I have an MRT756 integrated PcChips mobo with a Pentium111 533B, 128mram, 52x cd-rom, Fujitsu 13.6gig, Win98se. While I enjoy crash after crash after crash, I had to do many a format and re-install of OS; and like you I could only get so far and all went to ****. I've spent unbelieveable coultless hours just trying to get the puter to work and finally someone taught me how to boot from a cd and put all necessary cab files on my hard drive so I don't have to put up with this anymore. Here are the instructions I was given for this. Bear in mind that I have all my info written down on recipe cue cards and I will write it the way I have it written down. (I need to do this because my cancer meds fog my brain..lol)
-To do a fresh Win98 install. As computer boots press "F8" to get to the boot menu.
-Choose "Command Prompt Only" and press "Enter"
-At the "C>" prompt type "format C(space)/q (space)/s" (don't use quotation marks when typing the command)(/q means quick format and /s means copying system files)
-Again at the prompt, type the letter of your cd-rom such as or E: and press Enter.
-Now at this new prompt, type: cd(space)Win98 and press Enter
-At new prompt(which should look like this, "D:\WIN98>") type: setup(space)/ie(space)/im(space)/is(space)/iv(space)/nr and press Enter.
-Now load mobo drivers>video card drivers>sound drivers etc...

Hope this helps.

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Intel PC Constantly Rebooting

by IREChe In reply to Intel PC Constantly Reboo ...

Have tried to boot up using CD but can't even format HD to copy files to the drive.

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Intel PC Constantly Rebooting

by TimTheToolMan In reply to Intel PC Constantly Reboo ...

Hi,

The other thing I was thinking was that if you were running the monitor off the PC's power supply and you have a dodgy monitor, then the power spike when its changes modes - like when you get to the GUI - could be causing your problems....Try running the monitor off its own power connection.

Cheers,
Tim.

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Intel PC Constantly Rebooting

by IREChe In reply to Intel PC Constantly Reboo ...

Monitor is already running on its own power supply.

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Intel PC Constantly Rebooting

by TheChas In reply to Intel PC Constantly Reboo ...

With all that you have done, I think it's time to get ahold of a different motherboard and/or CPU.
At least for test purposes.

Another "test" would be to connect a scope to the 5 and 12 volt lines on a drive connector, and see if they dip significantly when the hard drive is accessed.
If the power supply drops low enough, the system will reboot.
Of course, you still need to determine which device is loading down the power supply.

If the drive connector voltages are solid, then check the output side of the on-board regulators.
This may halp you track it down to the MB, RAM, or CPU.

Chas

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Intel PC Constantly Rebooting

by IREChe In reply to Intel PC Constantly Reboo ...

Cheers...I've had the same idea. Decided to just swap the entire machine out. Will check the power supply to each device.

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Intel PC Constantly Rebooting

by IREChe In reply to Intel PC Constantly Reboo ...

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