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A general system board failure (Blink code 5) is the failure of a component not covered by the other

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Hp 6735b
Microsoft Windows 7 (32-bit)
A general system board failure (Blink code 5) is the failure of a component not covered by the other LED error codes. Contact HP for assistance.
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The notebook is not booting. Showing error. Blinking light caps and nums 5 times. Please help.
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I also cannot boot & just get a blank screen with num & caps lock flashing 5 times. I keep powering on & off. Eventually the system boots. 5 blinks indicate a general system failure. However, when the system finally booted, I went into BIOS diagnostics. I did a complete system check and this showed NO failure. Can't understand what is going on. Any ideas out there please? 

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The same thing happened to me on an HP ProBook. This is what I did.

First go into BIOS F2 & do system checks - Run Time, Hdd, Memory etc. This was all clear for me & so no problems there.

  1)  Computer off - take out battery  - unplug A/C.

  2)  Press power button on & leave finger on button for 30 secs.

  3)  Replace battery & A/C.

 4)  Power on & screen should boot.

If it doesn't.

Repeat steps 1 - 4  as above but leave finger on power button for 1 minute.

No joy?

Repeat again but leave finger on power button for 2 mins.

 

This is the 30sec- 1min - 2min procedure and usualy works for 50% of cases.

Hope this helps as it did for me & my machine is about 5yrs old now! 

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Any idea what this actually does?
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Had the same issue, spent MONTHS looking into it, all in vain, turns out a CMOS battery was the cause, less than 2 year life on these now? Jeeze HP, quality is slacking BAAAAD

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