Cannot access boot menu on ReadyNAS Ultra 6

Raidiator version 4,2,15

The hard locks started all by themselves. unit had not been touched in years. As the crashes began coming at shorter intervals and at times the unit would crash (herd lock) during boot) I took action. As a level 3 systems engineer I took the unit out and suspected a heat / dust dirt as a potential problem. As I do with servers and other expensive hardware I took the unit apart ad vacummed out the entire unit from top to bottom. I then re-inserted the memory as another potential issue. I also redid the dried out cpu compound while I was at it. I reassembled and then booted. No luck just crashes shortly after boot and raidar access and drive access via network then bam crashed. So I wen into the boot menu and perfomed a memory test only for about 14 hours and it ran a bunch of cyles, did not freeze or show any errors. Rebooted unit and here we are just shows the readynas logo on the dot matrix and nothing else, no network lights either but I assume that comes with a kernel boot.

Called for support as we were not able to get a copy of the data and I guess there is no answers when it comes to out of warranty product, its like they could not compute an answer off their scripts. I asked them to give me my options to get the data off, they provided no solution free or paid (i told them I would pay)

If anyone can help it would be much appreciated.  

Sorry I forgot to go through your post again. Nothing not pulling the drives not trying to access the boot menu again nothing gives me anything other than the Readynas logo on the screen. Raidar does not see it either nor do I hear it spinning up any drives while they were in.