My sys has two 256 mb ram i.e 512 mb ram I want to upgrade it to 1 gb?

Make sure the RAM is seated securely. The most common issue when adding memory is not seating it properly. Generally it takes some force to insert RAM fully.

On a desktop you will usually feel or hear a click as the side tabs snap home. On laptop I make sure to push in while levering them down to keep them seated. If that doesn't solve it try the 1GB by itself.

In the known good slot. If it still doesn't work then you have bad RAM or the motherboard doesn't support 1GB sticks or at least double sided sticks. Although I haven't heard of double sided being an issue since DIMMs.

Its either 512 or 1024, not 1536. Here is someone with the same problem http://www.tomshardware.co.uk/forum/2393...

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