Your Synology NAS has become unresponsive, or you have encountered any of the following issues:

• Unable to sign in to DSM.
• The web page running DSM freezes.
• The system is unable to restart.
• There are service interruptions or abnormalities.

Check if your Synology NAS is accessible via local network

1. Check if your Synology NAS is accessible via a local network.
2. If your Synology NAS is still inaccessible, check the Ethernet cable and network port.
   • Make sure you use a Cat 5e or newer Ethernet cable which is not bent or degraded.
   • Try to use another Ethernet cable to see if the problem has been solved.
   • Try to use another port on the router or switch to see if the problem has been solved.
   • Try to use another port on your Synology NAS to see if the problem has been solved.

If the issue persists, refer to the "Check if your Synology NAS is unresponsive" section below.

Check if your Synology NAS is unresponsive

Press and hold the power button on your Synology NAS for at least three seconds or until you hear a "beep".¹ The outcomes may be as follows:

• The system is responsive:
  • Your Synology NAS will emit a "beep" and successfully shut down the system.²
• The system is unresponsive:
  • Your Synology will emit a "beep", but will be unable to shut down the system.² Certain processes may prevent the system from shutting down.
  • Your Synology NAS will not emit any sound and will not be able to shut down the system.²

If your Synology NAS does not shut down after pressing and holding down the power button, you may have to unplug the power cord. After plugging it back in and rebooting, run a memory test and then check the status of your NAS. If your NAS cannot boot up, try the steps in this troubleshooting article.

Run memory test on your Synology NAS

Run a memory test at least three times. Do not use non-Synology memory modules or other devices that are not on the Synology Products Compatibility List to avoid risks of unexpected system errors.

Check the status of your Synology NAS

After rebooting your NAS, check the following:

1. Storage pool & volume
   Go to DSM Storage Manager and do the following according to your DSM version:
   • DSM 7 and above: Go to the Storage page.
     1. Check the storage pool status:
        • If there are any degraded storage pools, repair them first.
        • If the storage pools are running activities (such as adding drives, changing the RAID type, or repairing), wait for them to complete before checking if the problem has been solved.
     2. Check the volume usage. If the usage exceeds 90%, attempt to free up space.
   • DSM 6.2 and below:
     1. Go to the Storage Pool and check the storage pool status:
        • If there are any degraded storage pools, repair them first.
        • If the storage pools are running activities (such as adding drives, changing the RAID type, or repairing), wait for them to complete before checking if the problem has been solved.
     2. Go to the Volume page and check the volume usage. If the usage exceeds 90%, attempt to free up space.
2. Compatibility List
   • Make sure the drives are in the Synology Products Compatibility List.
   • Make sure the array is not a mixture of PMR and SMR drives.

• My Synology NAS cannot boot up and the Power LED indicator keeps blinking. What can I do?
• I can't connect to my Synology NAS on the local network. What can I do?