First my hp media center computer NEVER powers down correctly and whenever I try to turn it on I either get stuck on the first blue screen, or it turns on and works fine for about 5 minutes then freezes and I have to use the power button to restart it, or (and this is what usually happens) when I press the power button to turn it on it just beeps continually every second or so. the lights on the keyboard don't turn on and neither does the monitor. it's gotten to a point that I never turn off my computer any more.
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Try clear cmos, if the motherboard bad you must wait so long, maybe you can turn on computer, and they can work perfect, but when you turn off computer on power suply, you can´t again turn on computer.
If this so you have trouble with motherboard.
Alright let me be the first, let's check the simple things first. Did you try toggling the FN+F5 or FN+F6....if it is playing on the other monitor you already did that or it was toggled for dual monitor and that's why you're not getting any video.
hi friends, unpluug the power chord from the wall jack after that press and hold the power button in the front for about 15 seconds, connect the chord back in and try it. if it does the same then look at the rear side of the cpu box (where the power chord goes in and look for a small fan inside the power supply box, it has to be spinning). if not then the power supply (smps) has goen bad. now if the fan is sipnning try disconnecting all the extra periferals eg printer and stuff, still nogo then try opening the cpu box (reffer owners manual). take the RAM out and try to power up the system, if it starts beeping like beep ...beep... peeeep... then turn it off put the ram sticks back in and it should work fine...
NB:-for the owners manual check this out: http://h10025.www1.hp.com/ewfrf/wc/manualCategory?cc=us&dlc=en&product=470506&lc=en&jumpid=reg_R1002_USEN
I've checked your media center model on the net and it appears to be a known BIOS problem. Keep in mind that this is most likely video card or motherboard failure. But we can try resetting it
Try booting into the BIOS using the F10 key and then pressing F12 and pressing y. The system should reboot with the default BIOS settings. If there is any change you likely have a good chance at fixing it. Please post your results.