Why am I getting 1 startup beep when I have RAM installed?

I'm fixing an A1095 for a friend. She had been having some software problems with the interent that I fixed. She also wanted to upgrade the RAM. I powered down the device and checked out the RAM currently installed and tried to power it back on but am getting a single beep during startup (indicating there is no RAM installed).

At one point I had a 512 MB RAM stick installed and a 256 MB RAM stick installed, and I believe I got 2 beeps (incompatible RAM installed). Now I get 1 beep with any attempted configuration, including the following:

--

Slot 1 - 512

Slot 2 - Empty

--

Slot 1 - Empty

Slot 2 - 512

--

Slot 1 - 512

Slot 2 - 256

--

Slot 1 - 256

Slot 2 - 512

--

To kill some troubleshooting steps, answer the following three questions as well if you have the knowledge:

1) If only one stick is installed, does it matter if it is in slot 1 or slot 2?

2) For the purpose of the above question, which slot is which?

3) Will a 256 MB stick even work in this machine? I see "relevant parts" on the guide only include a 512 MB and a 1 GB.

Thanks!

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