RAM slot a1 and a2 not working

If one of the slots fails you'll have to replace the whole motherboard or use the laptop with only one working slot Buying a new motherboard

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1 pg slot entrance Try inserting one RAM module into slot 1, then 2, then 3 and then 4 The manual says what is recommended for one module or two modules or four modules, but

168pg slot If your computer is not booting up or your computer is showing the wrong RAM size, then one of your computer's RAM slots could be faulty