My 2008 x35 started a few days ago just fine but then battery was low and I was able to jumpstart yesterday but today had absolutely no power of any kind for lights or anything when I tried to jumpstart it I still had no electrical power anywhere is there a main computer fuse blown or is something else

MJF,

sorry to hear of your troubles.

Please be just a tad more specific in the problem description so our experts ( which is not me) can give you the best feedback.
-When you jumpstarted it yesterday where you able to drive it some distance?
- When you jumped it today. do you mean it didn't start or showed no lights internal at all?
- Where u unable to start at first, when connected to the jumper cable? Or that is did not stay running?
- When u connected the cables, from the other battery was the other vehicle running? Or you had a stand alone jump pack?

And while I am not one of the resident experts it does appear you may have blown a fuse or worse, it is easy to make an error in order of connection for a jumpstart or grounding incorrectly.
But I reserve judgment until some more details emerge.

A mistaken reverse connected jump will give these symptoms , where one or more fusible links blows,unfortunately . More info may help of course. Remembering accurately step by step what has occurred in each and every move you have made .

The day before the car was completely dead with no lights or any electrical items functions. I connected the jumper cables and made sure positive to positive and neg to ground and immediately the convenient lights came on and car started right up and I let it run for several minutes and everything worked fine but door locks acted funny locking on its own after I unlocked it. Next day the car was completely dead again and when i hooked up the jumper cables I could not get the convenience lights to come on when i opened the door. Car would not start and no electrical worked. Suggestions? Did I blow a main fuse somewhere?

Time for DC voltmeter checks of battery disconnected , then connect and measure at posts / along the cables. Then do 12Vdc " test lamp " for light on BOTH sides of ALL fuses , 1st , testlamp in ' off ', then testlamp them again in the ' run ' ignition position .
But a noticeable spark when reconnecting the battery ( full recharged ) sorta shows somethings "ON" and killing it overnight . Seeing those DC amps / milliamps is next needed test between neg. cable and Batt. neg.whilst they are temporarily separated just for this test.

Thanks for the help. Will get into this weekend and let you know what happens,.