BIOS Problems and Worrysome start-up

2 replies [Last post]
Joined: 10/16/2010
Posts: 11

My Current System:

ASUS P8P67-M Pro Motherboard
Intel Core i5 2500k CPU
4GB GSkill DDR3
Western Digital 500GB HDD
OCZ Vertex 2 90GB SSD
Corsair HX750 Power Supply

The rest is irrelevant.

If I plug in my external hard drive, I get an American Megatrends error message telling me to press F1 to go into the BIOS. Well, sure enough, I see my External Hard Drive on my boot order. I do NOT see my SSD (which I have Windows installed to). I also see my DVD drive and my 500GB HDD.

If I unplug my External HDD, everything is..."normal."

By "normal" I mean, if I power my system on, my fans start spinning, LEDs come on, etc... and then it shuts down after about 3 seconds. It stays shut down for 4-5 seconds, and then it automatically turns itself on again! Stays on for another 4-5 seconds, then powers down yet again! It does this sometimes 2 or 3 times, and then Windows loads.

What the heck is this!? I've read everything from it being a problem with my Heatsink being installed incorrectly (I'm using a Corsair H50 and I'm pretty darn sure it's on there securely), to the Power Supply Failing (I've had this PSU for about a year without issue), to the system running POST tests.

I can always re-check my connections for my CPU cooler and power supply even though I'm 99% positive they're all OK. I mean, once the system powers on...and stays on, it seems pretty stable. I'm able to rack up the kills in Battlefield: Bad Company 2 just fine and stay in games indefinitely it seems. I played through an entire campaign in Left 4 Dead 2, which takes about an hour without a hitch.

If it is as simple as running POST tests, is there a different way my particular Motherboard can do that without scaring the crap out of me by powering down, powering up, powering down, powering up etc etc...?

Also, if i put the computer in "Sleep Mode" I can't seem to get it to wake up! It does the whole power down - power up thing repeatedly. I have to hold the power button on my front panel to turn it off, and when I try powering it back up, It does the whole power up - power down deal and when it gets to loading the OS, it says "RESUMING" if it was in sleep mode.

This is a little worrying and very annoying. I am typing this message on the PC in question right now.

Any help or insight would be greatly appreciated!

Joined: 10/14/2010
Posts: 262

So first you have the machine resetting itself until it finally boots

and second there's an issue when you have an external drive connected at boot?

I have no clue about the second issue aside from checking the boot order, but the resetting sounds like a short. Is the motherboard touching the case somewhere? Are the mobo's standoff screws installed? Any loose wires hanging about? Next I would check the front panel connections, you know, the power and reset switches, are they connected properly?

Otherwise some component is causing a short or an error (during POST it checks if everything is working fine, rebooting is not some kind of POST testing, it's just a sign that POST failed or got interrupted). Does it boot fine with the minimum of hardware connected (just the RAM, CPU, keyboard and only the bootdrive)? If so, go from there and connect your peripherals one by one.

Oh and what you are describing about Sleep Mode seems normal to me.. aside from the power up/down thing of course.

Razear's picture
Joined: 12/30/2008
Posts: 1127

I'm assuming the external drive is USB? If so, disable legacy USB support in the BIOS and this will prevent the system from trying to boot from that drive. I have had the same reoccurring issue with an external Seagate USB drive and once I disabled legacy USB, the problem stopped.