Error No Disck at boot

[amiciamici]

I've a 4 bays NAS rtd1296_v4.9.1
Unexpectedly no longer boots.
"Non è stato rilevato nessun disco rigido!
Si prega di installare il disco rigido e provare di nuovo!"
No disk error.

I've tried turning it off and on again with different combinations of sichi inserted.
Bay 1, 1+2, 1+2+3, 2+3, 2, 2+3+4, 3+4 same error NO DISK

No previous message about bad sectors on disks.

I installed disk 4 on a PC and I can mount every single part, read its data, I see that it is part of a raid 5 system and no damaged data.

How do I restore boot?

[TMzethar]

According to the information you currently provide, there may be a problem of poor contact between the SATA board and the motherboard.
If your product has already been insured, you can consider disassembling and cleaning the golden fingers at the connection point (Please operate with caution)

[amiciamici]

I disassembled the NAS, removed the SATA card. Everything was very clean and securely attached. I reinserted the disks, but I'm still getting the same error message.

[RyanYang]

Firstly, you can try replacing the page file by referring to the following content: viewtopic.php?f=76&t=5250
If it still doesn't work, you can refer to the following content to reset TNAS: viewtopic.php?f=76&t=696
If it still doesn't work, you need to go through the after-sales process.