Installing a memory module. Why won't the monitor turn on?

Question

RAM

Hello. There is an ASRock N68C-S UCC motherboard. It has 2 ddr2 sticks of 512mb each.
I decided to put one bar ddr2 1gb pc5300 dimm, and was surprised - the monitor did not turn on. I thought that the problem is in the memory bar. I took a working ddr 3 2gb 1rx8 pc3 samsung 10600u as it also supports the board, but the result is that the monitor does not turn on again. I put back 2 strips - it works. Bios reset.
Tell me what could be the reason.

Answer 1

First, find another power supply and install it in place of yours. Look at the result.

Answer 2

If the new strips are obviously working, then there may be a simple incompatibility of the strips and the motherboard, despite the newest BIOS. Rarely, but it happens

Answer 3

This board, like all other combo boards (with slots for both DDR-II and DDR-3), supports only one type of memory at a time. This is clearly stated in the instructions.