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I have recently built a second PC (base unit) from spare parts including a second-hand Motherboard (Gigabyte GA-7ixe4) and CPU (Duron 850) acquired via ebay. The system powers up okay but that is all and it won't boot. I am staring at a blank screen and trying to figure out exactly what is wrong!
The symptoms are :
1 - Power switch on the front panel does nothing when pressed on/off.
Power can only be activated by using the on/off switch on the back panel of the PSU.
The PSU and it's fan, the CPU fan, Hard Drive and CDROM Drive all power up okay.
Power-on LED operates okay.
Hard Drive LED operates for a short period and then goes off.
Floppy Drive LED does not operate.
No warning beeps at any time from the system speaker.
No video display - nothing appears on screen at any time.
(video card is okay as previously tested in another machine)
It seemes likely that the problem is either the Motherboard or CPU. Does it sound as though the BIOS is screwed?
Does the mobo manual have anything to say? Also, I hate to mention this one because it sounds ridiculous, butt the pin configuration on the pre-morgan core durons made it possible to put it in backwards quite easily. Some of the cheaper BIOSes came without a beep code for mis-seated or missing CPU.
I played around with the machine all afternoon and the culprit turned out to be a new memory chip. After trying all the other things suggested I decided as a last resort to change the PC133 128MB DIMM with one that is known to be okay. Suddenly everything came on and it all appears to work okay!