New Posts  All Forums:Forum Nav:

5720 won't boot, fan revs up and down

post #1 of 6
3/9/11 at 8:10pm
Thread Starter 
I have a Sager NP5720 that has been great for many years. Recently, it started a strange behavior of virtually shutting down—screen turns off, no hard drive activity, no sound, doesn't respond to standard buttons—but the CPU fan would rev up and down. Now, the computer doesn't even boot anymore but just stays blank while the fan revs up and down.

It does respond to Fn-F2, the clock displays, and the wireless, camera, power, and plugged-in icons light. The HDD light blinks a little at the beginning, but then nothing.

I've cleaned the heatsinks, tried pulling out the RAM chips (one at a time), reseated all piece, plugged into an external monitor. Still, I never even see the CMOS of the computer.

I tried searching the forums, but my keywords were either too short, or I couldn't find any information that seemed applicable. Has my 5720 died after all five years?

Thank you in advance for your help!
Reply
Reply
post #2 of 6
3/10/11 at 11:53am
Quote:
Originally Posted by DJosephDesign View Post
I have a Sager NP5720 that has been great for many years. Recently, it started a strange behavior of virtually shutting down—screen turns off, no hard drive activity, no sound, doesn't respond to standard buttons—but the CPU fan would rev up and down. Now, the computer doesn't even boot anymore but just stays blank while the fan revs up and down.

It does respond to Fn-F2, the clock displays, and the wireless, camera, power, and plugged-in icons light. The HDD light blinks a little at the beginning, but then nothing.

I've cleaned the heatsinks, tried pulling out the RAM chips (one at a time), reseated all piece, plugged into an external monitor. Still, I never even see the CMOS of the computer.

I tried searching the forums, but my keywords were either too short, or I couldn't find any information that seemed applicable. Has my 5720 died after all five years?

Thank you in advance for your help!
Sounded like a bad case of either GPU or motherboard failure

cheers ...
Reply
Reply
post #3 of 6
3/10/11 at 12:40pm
Thread Starter 
Yeah, I'm thinking motherboard. I have once before baked my GPU. But the last time I had GPU problems, they were evident before the computer would shut down (screen would go crazy, alien messages across my documents, subliminal "UPGRADE" advertising, you know the drill).

Should I try baking the GPU again? I assume I can't bake the motherboard.
Reply
Reply
post #4 of 6
3/10/11 at 12:51pm
Sure I would try the GPU bake again. And I did bake my motherboards when the GPU was being integrated into them - same principle.

Good luck

cheers ...
Reply
Reply
post #5 of 6
3/10/11 at 1:15pm
Thread Starter 
Isn't that plastic around the CPU? I was thinking the motherboard would have meltable parts.
Reply
Reply
post #6 of 6
3/10/11 at 2:40pm
I just strip everything that is flimsy looking plastic, 150C for 7 minutes -> 220C for 5 minutes -> backing down to 150C for 4 minutes; turn oven off, leave oven door open and don't touch/move anything for about 1 hour.

The CPU socket base would withstand the oven's heat. So far I haven't fried one yet

cheers ...
Reply
Reply
New Posts  All Forums:Forum Nav:
  Return Home