I have a laptop presario F500 that when I press the on button the fan turns on and I hear the HD but no video. I then need to turn it off and restart in order for it to boot up and video appears. It works fine after this. Does anyone know why it's doing this? It never did this before. I just had the motherboard,cpu, fan and heat sink changed this week since it was previously starting up but with no video.
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I've seen this symptom when a disk drive begins to "spin-up" slower than it should (since you indicate you do hear it beginning to spin)
The first attempt the HDD is starting cold and from dead-stop. Quickly re-starting the computer the HDD platters can either have not completely spun-down yet, or the bearings have been "warmed up" a bit and the characteristics change enough such that it "spins-up" more quickly.
Once it's up and running use a SMART attribute interrogation freeware program to check the "spin-up" time attribute, and see if it is below spec or degrading. Lots of them out there...
Some SMART reporting programs
A number of such freeware programs are available from sites like majorgeeks, download.com, etc.
edit to add:
I should point out that "spin up time" isn't the only attribute that can cause problems like this. Example: If the HDD is experiencing massive read or write failures (which can't be recovered or take too long to recover from) that can cause a similar result.This can sometimes suggest the HDD platters or R/W heads are out of alignment. Restarting the HDD can result in slightly changing the relative alignments and the problem "goes away" until next time the drive has been sitting "cold" for awhile. Excessive sector re-allocation can be another indicator the drive is on its last legs and should be closely monitored and may warrant being replaced entirely.
Thanks for your fast reply. Prior to downloading the software, I decided to try a different HD and it does the some thing. Power on, power off and then power on again in order for it to start. I noticed that when I power off I hear a click in the HD everytime so I know that it will now start up. Not sure why it's doing this click sound prior to starting and booting up the second time around.
Another possibility is that the laptop's internal power supply/distribution has been slightly degraded.
For example, when device is first turned on after sitting "cold" for awhile there is an initial surge of current that can be significantly higher than if the device has been switched off for less than 10 seconds. If the power supply is degraded in some way, it may be unable to handle that initial "cold start" current surge. But on the follow-up try that inrush current may not be as high and so the PSU is able to handle it.
Is there any way you can reduce the load on it? Remove a RAM module, a modular CD/DVD drive, disconnect something taking power from USB ports, etc and then retry?
(BTW, I'm also assuming you have the problem whether or not the laptop is connected to AC power?)
If you go this route, be sure to use proper ESD control handling methods and make sure the battery is removed before you start removing items. Follow the instructions in the user manual.
removed a diagnostic section for now. Can address later.