Acer does not recognize the motherboard model number. You need the computer model or SNID (Serial Number ID) found on a sticker on the back of the original tower case.
Without the manual, jumper configuration is a nightmare. Here is the layout for the 915M08G8KS:
| Jumper | Location | Pins | Function | | :--- | :--- | :--- | :--- | | CMOS Clear (CLR_CMOS) | Near CR2032 battery | 3 pins | Pins 1-2 = Normal; Pins 2-3 = Clear CMOS (move jumper for 10 seconds) | | BIOS Recovery (JBIOS) | Near Winbond chip | 2 pins | Short to force boot block recovery (requires floppy with BIOS file) | | Front Panel (JFP1) | Bottom-right corner | 9 pins (2 rows) | Pin 1+3 = Power LED; Pin 5+7 = HDD LED; Pin 6+8 = Power Switch; Pin 9+11 = GND/Reset (varies by revision) | acer socket lga775 pcie motherboard 915m08g8ks manual
To reset CMOS without a jumper: Remove the silver coin-cell battery (CR2032), unplug PSU, wait 15 minutes. This is universal for this board.
| Symptom | Likely Cause | Action |
|---------|--------------|--------|
| No power, fans off | PSU failure or short | Test with known-good PSU; check standoffs |
| Continuous long beeps | Memory error | Reseat RAM; test one DIMM at a time |
| One long, two short beeps | Video error | Reseat GPU; clear CMOS; test with integrated VGA |
| System powers off after 2 seconds | CPU overheating or unsupported CPU | Check HSF installation; verify CPU compatibility |
| USB devices not detected | Legacy USB disabled | Enable Legacy USB Support in BIOS |
| SATA HDD not seen | Wrong BIOS mode | Set to Legacy IDE or install F6 driver | Acer does not recognize the motherboard model number
Cause: The SATA ports on 915M08G8KS are in IDE emulation mode.
Solution: Enter BIOS > Integrated Peripherals > Onboard SATA Mode > Set to IDE (not RAID or AHCI). Windows XP/Vista/7 will not boot from AHCI mode on this chipset.
Without the manual, owners of this board encounter three specific problems. Here is how the manual solves them. | Symptom | Likely Fix | |---------|-------------| |
BIOS limitation: Max FSB 800 MHz; 1066 MHz CPUs will not boot.
| Symptom | Likely Fix |
|---------|-------------|
| No POST, fans spin | Reseat RAM, clear CMOS (short CMOS1 for 10 sec), check CPU 4-pin power |
| Beeps (long, repeating) | RAM issue – try one stick in DIMM1 |
| Beeps (1 long, 2 short) | Graphics error – reseat PCIe card or use onboard VGA |
| USB ports not working | Check BIOS > Integrated Peripherals > USB Controller Enabled |
| SATA drive not detected | SATA mode must be IDE (not AHCI – ICH6 doesn’t support AHCI well) |