boot modi
Besides the normal "retail" bootmode there are several other modi the console can boot or halt in:
 Fan test
- With the PS3 power switch in the off position, turn power switch back on while holding down Eject button. This "fan test" mode allows you to clean out the dust inside the PS3. It works for Models CECHG and higher. (Note that a plugged in PS3 Slim does not have a power switch at all and is always in standby).
 Other special modi
The following requires the power switch in the back to be on:
- Hold Power button down for 6 seconds (while PS3 is on): turns off PS3.
- Hold Eject button down for 6 seconds (while PS3 is on): force disc to eject.
- Hold Eject button down for 12 seconds (while PS3 is on): reset Blu-ray.
- Hold Power button down for two beeps (while PS3 is off): Reset video to lowest settings.
- Hold Power button down for three beeps (while PS3 is off): Enter PS3 diagnostic mode (repeat procedure twice)
- Hold PS button down on controller for 10 seconds: Turns off Sixaxis or Dualshock 3.
 JIG / Factory Service Mode / manufacturer
- The PS3 can enter a special "Service Mode". When it does (and can boot harddrive/dev_flash) the bottom right hand corner of the screen has a red translucent rectangle with the words "Playstation 3. Factory/Service Mode" inside of the rectangle. When the PS3 is off, plugging a special "JIG" in the USB port (and then pressing Eject immediately after pressing the Power button), the PS3 is triggered into Service Mode when it boots up. This special mode then accepts firmware code loaded in from the USB port (PS3UPDAT.PUP), and allows reflashing the firmware chip, or running programs from a USB drive.
 LED Diag Mode
I have found what I think is a diag mode that displays error codes using the power button light, kind of like what an OBD-1 ECU on a car would do. To activate it you have to do a fan test and wait until after the ps3 powers off(this much I am sure of) then you have to press eject and then power rapidly many times in succession also try holding eject and pressing power. Once you enter this mode the power light will flash yellow for about 1 second then the status of 4 component's(which ones I don't know) within the ps3 will be displayed by the power light blinking 4 times for each 4 component's. Then the yellow light blinks again letting you know the cycle has started again.
- On my bricked slim (CECH-2501B) the first sequence of 4 is: green red green red.
- On my working slim (CECH-2101B) the first sequence is: red red red red.
- On my other working slim (CECH-3001A) the first sequence is: red red red red.
- On all three consoles the next 3 sequence's, are all red.
So it seems that red=good and green=bad. Also I removed the Blu-ray drive on my bricked slim and the codes did not change. sorry I don't know more about this.
I have now bricked the CECH-2101B and it also displays green red green red as the first sequence of 4
Anyone with a ylod console please post their symptoms and result of this test
Probably Green = 1, while red = 0. So you get 16 bits.
Blu-ray drive is not a core part of the system, it will boot without it just fine.
Cannot seem to get led diag to work on CECHA fats, don't know what FW version.
 Errors on boot
Error output in order of appearance and likely suspects:
NLOD - No Led of Death
- Failure in the hardware_init stage. Suspects: Power disconnected, switch off, Power Supply, 12V fuses
 Solid Red
Solid Red - Powered Standby mode
 Solid Green
Solid Green - Powered On.
 Solid Blue
Solid Blue - Disc present in Bluray Drive
 Flashing Blue
Flashing Blue - Disc inserted in / being ejected from Bluray Drive
YLOD - Yellow Led of Death (Flashes Green, Yellow then Red)
- Failure in the hardware_init stage. Suspects: RSX, CELL BE, XDR Ram, GDDR Vram, Syscon, South Bridge , Starship2 (if NAND SKU), NAND/NOR Flash, Power Supply, Fuses, Regulators, Cooling/Fan
If you ground out tristate on a console with YLOD, it would GLOD instead if it is caused by bad flash. This makes it an easy way to check if the YLOD is flash caused (most common) or RSX caused (second most common).
RLOD - Flashing Red Led of Death
Seen in combination with poweroff when downgrading below metldr/bootldr capability
GLOD - Flashing Green Led of Death (or when nothing is bad: PS3 is powering off)
RSOD - Red Screen of Death error msg "serious error has occurred"
- Registry bad : Easy fixable by following instructions or using Recovery
- Dev_flash files integrity fail : Seen when using Spoofed index.dat/version.txt without patching VSH.self too (e.g. RogeroV3 -> solved in RogeroV3.1)
- Bad mounting of dev_flash : Seen when mounting improper R/W on USB ala mount alejandro
- Broken/dying harddrive : Caused by aging, bad head/platter reads. Check with other drive.
 XMB error msg
XMB error msg
- RSOE (red screen of error) - looks alot like RSOD, but with only 1 language and an errorcode)
- Failure after initial firmware stage. Suspects: Harddrive content: User specific files/settings in UFS2 partition.