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No Operating System with Ram increase

By Actaeon ·
I have an IBM refurb'd P3, 500MgHz with 128 meg PC100 SDram. When I got it there were two 64mg sticks of RAM. I got a 128 stick of RAM and added it to the 3rd slot on the MB.
When I booted the config screen came on and showed 'no operating system'. I removed the 128 stick and it booted normal.
I took out the two 64meg sticks and put in the 128 and it booted fine.
I got another 128meg stick and put it in and got the error again.
Is there a setting I must change to enable the higher amount of RAM?
I'm running Win98se.

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by jschein In reply to No Operating System with ...

you need to ensure you motherboard BIOS is up to date. Goto the manufacturers website and download the latest bios.

Also, ensure the memory types are not different... i.e. 100mhz and 133mhz.

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by TheChas In reply to No Operating System with ...

You don't have a W98 problem (the large RAM issue is with more than 511MB of RAM) you have a system BIOS or RAM compatibility issue.

I haven't seen this on a P3 system, but some systems do have limits for DIMM size.
I have seen systems where if there is more than 32MB in either of the first 2 DIMM slots, the 3rd slot is disabled.

More likely, your problem is that the RAM modules you used are not compatible with each other.

You may need to have all DIMMs be of the same "density", number of clock lines, or CS level.

I recommend checking what style of DIMM and size limits Kingston, Crucial, or PNY recommend for the system.

I do my best to use the same type RAM in ALL slots.
If I don't have enough of the same brand of DIMMs, I look at the memory chips on the DIMMs and compare the chip manufactures specifications.


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by johann2_2 In reply to No Operating System with ...

IBM PC's are well know for having RAM compatability issues. Have you verified that the RAM chips are compatible with each other according to IBM? If not sure I would suggest consulting the Kingston RAM charts for your particular PC. You must make sure that all the chips are compatible before installing and even then they can be questionable.

PS: You will probably (but not guaranteed) find that purchasing from IBM itself works best, although somewhat expensive.


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