First, here's the computer information:
Gateway Profile 3 (one of the all in the monitor computers)
Pent III 933 MHz
133 MHz Bus Speed - Verified in the Setup pressing F2 at bootup
RAM is (was) 128MB PC-133 SDRAM (2x64MB)
Max RAM is 512MB (2x256MB) - According to Gateway's website for this exact model
Bios Veriosn: 1AAOEP01
OS: Windows XP Pro (no SP2)
30 GB HD
Now, the first thing I did was wipe the computer clean and reinstall XP PRO. Everything works great. But since the memory was low, I wanted to max it out. I bought two sticks of 256MB PC-133 168D SDRAM to equal the desired 512MB.
When I install the sticks, I get this message at boot up:
"A memory module's SERIAL PRESENSE DETECT (SPD) device data is missing or inconclusive. Load at 100 MHz buss speed?"
"Press ESC to Exist or Enter to Continue"
What's even more weird is that when I hit enter, the system works fine except it only recognizes half the RAM. For example, if I have both 256MB sticks in, it says I only have 256 RAM. If I have just one in, it says I only have 128 RAM.
One more weird thing, if I put one of the new 256MB sticks in with an older 64MB stick, it boots with NO errors/warnings and states I have 192 RAM (half my 256 + the full 64). The old RAM is also PC-133 SDRAM.
I have tried only one in each dimm, both in each, vice versa, every combination.