I thought I would run the following problem past CDfreaks:
Bought a new RAM stick for a friend to upgrade their PC. The RAM in question is a Crucial 256Mb SDRAM PC133 CL2 which can be seen here .
In the friend's PC - a horrid old P2 HP 'Pavilion' - the RAM was not recognised at all. Don't know what mobo that was at the moment...will go back and find out if solution not obvious...
No boot up/ POST so cannot get to BIOS to start tweaking settings.
Took it back to one of my PCs - ECS K7SOM - and ditto, the RAM was not recognised, no startup.
At this point, thinking I might have a DOA I check it in my other PC, ECS K7S5A+ --all works fine, recognised, stable, no problems whatsoever. It even works in tandem with my other DIMM. i.e. nothing wrong with the RAM.
The following are my thoughts about the possible causes - please could the more technically minded rate the probability of each or suggest other reasons.>.?
- Something to do with the BIOS of the first two boards. Either not latest version or needed to be CMOS cleared before swapping in a new type of memory.
- First two boards don't support PC133, only PC100 (shouldn't be the case for the K7SOM).
2b. First board didn't like PC133, second board failed for totally different reason.
- First two boards relied on RAM for video memory whereas the third has a proper AGP video card, so using system memory for vga caused some problem...
- Complete randomness, no particular reason; I will never know why.
- Some annoyingly complex reason relating to parity, ECC, voltage etc conflicting with the abilities of the chipset.
All suggestions will help reduce my state of bafflement and aporia.