PS3 turn off after 10 sec

My PS3 slim CECH-2504A turn off after 10 sec, so I downgraded and put lv2diag.self and PS3UPDAT.PUP (kmeaw 3.55) on stick, after that I put another lv2diag.self. And then I turned on PS3 and after 10 seconds it shuts down, I can see HDD activity and lights on e3 flasher, no blinking red light or beeps. I can't go to recovery mode. HELP ME PLEASE!
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I just figured PS3 stays on for 1 minute without HDD, hmmm can someone help me?