Plugged the wrong RAM and now the motherboard only lights up HDD LED
I replaced the original DDR333 RAM with two new pieces of Registered EPP-ROM DDR400 RAM from a Xeon server, and the computer turns on only with the HDD LED lit up and CPU fan on. Put the original RAM back but it stayed the same.
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Re: Plugged the wrong RAM and now the motherboard only...
Try leaving it unplugged for a few minutes. if that doesn't work, then turn it back off, remove the ram completely, reboot without it in there, then turn it back off, then reinstall the original ram, then turn on again. (might sound ridiculous, but the computer is just not recognizing the ram) you'll want to be sure that it is completely pushed in also. otherwise it will fail
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Hmmm.... mainly you have: -20 or 24-pins connector, that is unique and goes directly to motherboard (powers motherboard and its components) -4 or 8-pins connector that powers CPU -the rest would be connectors for ROM (CD/DVD/BlueRay) and HDD devices (there are: molex and sata power conectors)
every motherboard should have a led light always on to indicate that there if power in it. the problem with system rebooting has to do with the ram or processor, since you said it does not recognize the hdd at times that means that the ram is working abnormally i.e it is week, u know ram means random access memory, so change the ram and make sure u get the right ram for your system
Is this new ram or have you used it in this machine previously?
A couple of things can cause what you describe, one of them being the wrong voltage of ram. This page contains the list of memory that your system can use, check the part number on your current ram in google to find out what voltage it runs at (the recommended voltage for your board is 1.8v).
Other than that you may want to do a CMOS reset by changing the jumper block (should be described in your mobo manual), powering the machine on briefly, power it down (unplug) and return the jumper to it's original location. Now try to post the machine.