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GA-6IEML mainboard, Celeron 1.3GHz, 2 x 128MB PC133 SDRAM.
Powered up system, with IDE cables connected, front panel connectors correctly, power system up, CPU fan spins for half a second or so, then system goes off. In bottom right corner of mainboard, yellow LED is on, possibly an error code? Any ideas?
Usually when a system shuts off that quick it's an improperly installed heat sink. Check that the heat sink is fitted correctly and the thermal compound is properly
applied.
Good luck.
Reset CMOS either with a MB jumper(see MB's documentation), or by removing the CMOS battery for a few minutes.
If no luck, then replace the CMOS battery.
If still no good, then install only the PS, MB, and CPU. If the problem still happens, then either the PS, MB, or CPU is probably bad. Either swap them out, or have them tested.
If it powers up, and emits beeping sounds, then install the RAM. If it makes a different beeping sound, then install the video card, monitor, and KB. If there's now a display, then install all other components one at a time until the problem resurfaces. The last component installed is the culprit.
[Edit] Others have posted while I was typing... :)
The yellow LED is the memory power indicator. DIMMS should not be removed or installed while this lamp is lit.
Since you're referring to cable connections, has the board just been set up? Is the PSU known to be OK? If possible, substitute a known good one.
When a system won't start, it's best to revert to the simplest configuration - disconnect drives and remove any non-essential expansion cards - eg if there's an AGP video card, revert to the onboard video. Make sure the memory modules are correctly seated. See if it will boot up. If it does, one of the disconnected devices was causing the problem. Re-connect one by one, the one that provokes the stalling will be revealed.
If no boot-up, and you're sure the board should be correctly set up for the CPU fitted, try clearing the CMOS in case corruption of the CMOS data is setting an unbootable condition.
If the board still will not start, attempt to boot with no memory fitted. If the CPU is operating, you should get insistent beeping from the system speaker/beeper to warn of missing memory. Absence of this POST warning beep sequence indicates a motherboard or CPU fault.