What's your cpu first?
Ill assume its not an i7 so you should setup your ram like this
| 1 | 2 | 3 | 4 |
Depending on the motherboard (check manual) slot 2 and 4 may be the primary slot. If so, you put the 2gb ram in slots 2 and 4, then the 1gb rams in slot 1 and 3
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