Jul 8, 2010 - Weighing in at just under 6 pounds sans power brick, the new HP ProBook 4520s feels solid and sturdy enough to bear the brunt of your daily.

Last night I downloaded the BIOS update setup sp57752 - HP Notebook System BIOS Update for my HP Probook 4520s laptop. During the installation, when the software was displaying something like writing block 400 / 640. The power malfunctioned and the laptop turned off. (The battery was very low and my UPS was not working).

Anyways, right then I knew the laptop was bricked. I restarted the laptop and this is what happens. • The display stays off. • The CAPSLOCK key light keeps blinking. • The power button doesnt do anything, even if held down for 30 seconds or more. The only way to power off is to disconnect the battery and the charging cable.

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I know I'd most probably need to take the laptop to HP customer care. But I was wondering if there was ANYTHING I could do myself to fix this issue. I know how to disassemble the laptop. I know how to take out the RTC battery. I wanna know if it'll be sufficient. Or will it require special hardware cables / serial ports / etc and proprietry procedures that only an HP technician will be able to perform.

Taking out the RTC battery which powers the RealTimeClock will not help. That battery powers the real time clock and the volatile part of the BIOS. The BIOS program itself is stored in non-volatile storage. When that gets corrupted you have a few options: • Be the lucky owner with a rescue BIOS option. Intel did this a while. Their BIOS was split in two parts, the first part allowed minimal booting from a floppy and updating the BIOS.

The second part contained the rest. Most upgrades only changed the second part, so you could recover if that went wrong. • Be the lucky owner of a board with two BIOS chips. Sometimes one if a rescue version. Sometimes they are two full versions and you can select which one to use. There are only a few motherboards which use this, as well as a few graphical cards. • Be the owner of two identical motherboards and have a socketed BIOS chip.

That allows you to boot the identical computer (the one with the working BIOS). After it is booted an the BIOS is not in use (or copied to shadow RAM) you can carefully remove the chip and replace it with the EEPROM with the broken BIOS program. Then flash that chip. I have done that once before, but that was on a desktop board (Asus P2B-Ds, pentium-2 era).

It is unlikely that a chip on a laptop motherboard is socketed, since space is at a premium. • You might be able to program the BIOS using a interface.

The hardware for that is not hard to come by, but you will need board specific knowledge. This is possibly how a repair technician will fix your board. (Or more likely, he will just swap the motherboard with a new working one and ship the broken one back to HP, who might refurbish it after repairing it that way.). The LED will likely be blinking a specific pattern.

HP suggests the following Identify the number of blinks or beeps When there is a start-up problem and you see LED lights on the keyboard blink a few times (between 1 and 8 blinks), or hear a series of beep tones (between 1 and 6 tones), do the following actions. There is very little you can do to resolve blink or beep code messages until you contact an HP Support Agent or authorized HP Service center. Recognize Blink Codes With the development of the Extensible Firmware Interface (EFI) environment, the HP Pavilion and Compaq Presario notebook computers built in 2009 or later use blinking LEDS to identify hardware component reporting an error during startup. The codes are not valid for other models. 1.Press the power button to turn on the computer, and look for blinking LED lights on the keyboard. 2.Count the number of blinks in the sequence (between1 and 8 blinks).

After the sequence of blinks or beeps, there is a pause for a few seconds, and the sequence is repeated (usually 3 or 4 times). The blink sequence can be repeated by pressing the power button again. Recognize Beep Tone Codes On older computer models, the startup hardware diagnostic tests used a series of tones (beeps) to identify the error codes. Blink codes and beep tone codes have a similar purpose but do not indicate the same error conditions. The meaning of the number of tones in a sequence and duration of the individual beep tones is specific to the individual models. There were fewer beep codes on older computers because there were fewer built-in diagnostics. Component Tested Error Condition LEDs blink 1 time CPU CPU not functional LEDs blink 2 times BIOS BIOS corruption failure LEDs blink 3 times Memory Module error not functional LEDs blink 4 times Graphics Graphics controller not functional LEDs blink 5 times System board General system board failure LEDs blink 6 times BIOS BIOS authentication failure More info.