Pavilion Slimline lock up in sleep mode-fan works high not lights up unless I pull the power cord 1

New HP Pavilion Slimline desktop 400-314 - mode 'sleep' sometimes cause to lock the computer, the power light is on, the fan runs at the top.  Only way to unlock the computer is to hold the power button for 5 seconds.  I wait 15-20 seconds, then press the power button to wake it up.  Immediately the computer restarts to the top with solid power light and the fan turns at the top.  The only way to break this vicious circle must first pull the power cord to the rear, wait 30 seconds and plug it in again.  This time, when I turn on the computer it goes off just fine.

Is this a BIOS problem?  Please help as I don't have that much hair left.

* Solved * Finally!  After 8 grueling days of pain staking agony and incessant attempts to fix this thing, I finally solved my problem.  I spent countless hours on the phone with HP support and nothing resolved.  That is: the problem with this computer locking up and sending the fan at high spin was due only with external speakers. When you reset the power system disconnected to boot the system, he would normally go for at least half a day before locking up.  I discovered that the speakers are older than 15 years. It's funny, these speakers worked fine on a desktop HP 2004 previous Pavilion running on Windows XP.  Now, it's static build-up that caused my death or something else?  As far as I know, it's that I'm a happy camper using headphones with a new system of HP that finally works.  Thank you to everyone who made suggestions.

Tags: HP Desktops

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