| Beeps | Meaning | | :--- | :--- | | 1 long, 2 short | Video adapter failure (bad GPU or loose PCIe card) | | 1 long, 3 short | No memory detected | | Continuous long | DRAM not properly seated | | Repeated short (fast) | Power supply issue |
These documents are behind Acer's paywall but can be found on archive.org or manualslib.com under the desktop model name, not the motherboard name. acer h61h2ad manual top
| Pin | Signal | Wire color (Acer OEM) | Note | | :--- | :--- | :--- | :--- | | 1 | HDD LED + | Red/White | | | 2 | HDD LED - | White | | | 3 | Power LED + | Green | | | 4 | Power LED - | White | | | 5 | Power Switch | Blue | Momentary | | 6 | Power Switch Return | White | | | 7 | Reset Switch | Orange/White | | | 8 | Reset Return | White | | | 9 | Empty (NC) | – | | | Pin 10 | Key / Missing pin | – | Prevents reverse insertion | | Beeps | Meaning | | :--- |