A strange error

Hello,
My box has been used for about 4 years and I power it off every night. Recently, it shows a strange error described as below:
1) On first power up, blue screen is likely to happen within 10 minute.
2) After blue screen, restart it immediately gives a blank screen
3) keep the box power on with blank screen for about 10 minutes and then power it off for about 5 minutes. Then power it up and everything is ok. it can be run for until off.
4) if you don't warm it up or cool down in (3), it keeps on gives blank screen.

I've try replace the MB battery but it does not help.
So, may I know what may be wrong with the box.

thanks for your advice
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More about strange error
  1. check your power supply. It may be failing.
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