Windows XP 256 mb RAM 40 gb HD Pentium 4 2.0 ghz Motherboard: PC Chips M925 - Socket 478 4 memory slots: 2 DIMMs for PC133 SDRAM, 2 DDR DIMM for DDR266 SDRAM (PC2100) Memory expands up to 2 gb I bought 2 memory chips today: Kingstone DDR PC2100 256MB each. Took the old chip out (SDR PC133 256MB, some generic brand) and put the new ones in. I have almost no experience in this, but of course I put them in the correct slots. I make sure they're in place and turn on the PC. Nothing. It starts up a bit but then it dies. The monitor won't turn on. I unplug the PC, restart it a couple times, check the chips again just in case; still nothing happens. So I take the new chips out, put the old one back in and it works perfectly as before. I did all the process as carefully as I could, I don't think the new chips are damaged. Could someone give me some advice on this? I'm thinking of just exchanging the new chips for a SDR PC133 512MB but I would like to know first if maybe I'm doing something wrong. Thanks in advance!!

I don't see a dipswitch on your mobo which allows your to reset the CMOS. If there is one, resetting the CMOS may help. If no, see if you are allowed into the BIOS to load default settings.

attach your SDRAM, then boot into CMOS. Check your memory settings and/or do what shawn tells you. If it does'nt work, try contacting the manufacturer of your board and ask what kind of DDR is allowed in your board or try reading your motherboard manual.

Hi had the exact same thing with a PC Chips mother board. I bought ECC ram in error.

you didn't say you set JP1 to short pins 1-2 DDR and Sdram use different voltages etc JP1: DRAM Voltage (VCC) This jumper enables to select voltage of DRAM. Function Jumper Setting 2.5V (DDR) Open Pins 1-2 3V (SDR) Short Pins 1-2 also J2A/B/C/D, J3A/B/C/D: DDR/SDR DRAM Type Selector. This jumper enables to select the type of DDR or SDR DRAM. Function Jumper Setting DDR1,DDR2 Short all J2A/B/C/D and J3A/B/C/D pins DIMM1, DIMM2 Open all J2A/B/C/D and J3A/B/C/D pins YOU can't go wrong READING the manual