Cutting to the chase, Sony's v.4.45 patch for the PlayStation 3 ended up soft-bricking a lot of consoles and a lot of those folk aren't very happy about it. It is the week of The Last of Us' release, after all. By soft-brick I mean the patch broke the OS, which means the console still has power, but it can't run until the software behind the console is fixed. Luckily, Sony found the issue and will be issuing a fix on June 27.
Here's the latest update from Digital Platforms Community Manager Morgan Haro (mochuu):
"We have identified the issue related to the PlayStation 3 software update (version 4.45) that impacted a small number of PS3 systems earlier this week. A new PS3 system software update is planned to be released on June 27 that resolves the issue. Thank you for your patience and understanding and we apologize for the inconvenience."
Odds are if your console was effected by the issue it won't be as simple as turning on the console and having it work again. Fixing the problem may involve a flash drive, or perhaps just booting the PlayStation 3 in a different manner than usual. Make sure to follow Sony's updates on their forums which will likely soon have proper instructions.
While I hate to even bring it up, I'd be remiss if I didn't mention that this is a startling occurrence to come so close after E3. An E3 where both Microsoft and Sony were so proud to discuss how the Xbox One and PlayStation 4 would issue updates in the background without players ever noticing. Can we expect random soft-bricking to be commonplace in the future? Probably. Future, you're scary.