System: Host: AcerMini Kernel: 3.2.0-2-686-pae i686 (32 bit, gcc: 4.6.3)
Desktop: KDE 4.7.4 (Qt 4.7.4) Distro: Debian GNU/Linux wheezy/sid
Machine: System: Acer product: AOA150 version: 1
Mobo: Acer model: N/A Bios: Acer version: v0.3310 date: 10/06/2008
CPU: Single core Intel Atom CPU N270 (-HT-) cache: 512 KB flags: (nx sse sse2 sse3 ssse3) bmips: 3192.21
Clock Speeds: 1: 800.00 MHz 2: 800.00 MHz
Graphics: Card: Intel Mobile 945GSE Express Integrated Graphics Controller bus-ID: 00:02.0
X.org: 1.11.4 drivers: intel (unloaded: fbdev,vesa) tty size: 80x35 Advanced Data: N/A for root
Audio: Card: Intel N10/ICH 7 Family High Definition Audio Controller driver: snd_hda_intel bus-ID: 00:1b.0
Sound: Advanced Linux Sound Architecture ver: 1.0.24
Network: Card-1: Realtek RTL8101E/RTL8102E PCI Express Fast Ethernet controller
driver: r8169 ver: 2.3LK-NAPI port: 3000 bus-ID: 02:00.0
IF: eth0 state: down mac: <filter>
Card-2: Atheros AR242x / AR542x Wireless Network Adapter (PCI-Express) driver: ath5k bus-ID: 03:00.0
IF: wlan0 state: up mac: <filter>
Drives: HDD Total Size: 160.0GB (-) 1: /dev/sda Hitachi_HTS54321 160.0GB 40C
Partition: ID: / size: 148G used: 6.1G (5%) fs: ext4 ID: swap-1 size: 1.50GB used: 0.00GB (0%) fs: swap
Sensors: System Temperatures: cpu: 56.0C mobo: N/A
Fan Speeds (in rpm): cpu: N/A
Info: Processes: 159 Uptime: 6 min Memory: 457.6/996.6MB Runlevel: 5 Gcc sys: N/A Client: Shell inxi: 1.7.33

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Please find above the specs for this system.
I have Skype for Linux installed and tested sound input both ways: built-in mic and headset, none work.
Sound output is fine, but I also need input.
Thanks.

Have you verified using KMix that the input is not muted?

It was, thank you very much for your usually accurate advice.