i have a dell vostro 1500 with gfx card g86-730-a2. when i power it give me led error no dimm installed.then when i put memory in the dimm slot it power off after 5sec or sometimes give a single led error flashing memory initialize error .i have changed the bios also changed the micom mec5025-nu.basically it does not see the dimm ram installed.where can the problem be.
thanks.does anyone have working bios

The bios from Dell official site:

or take the dump here.

For example, bad DIMM slot, bad north bridge or broken of soldering under...
Check the data communication at the (193 DIMM_SMDATA, 195 DIMM_SMCLK) of DIMM0, DIMM1 by oscilloscope.