My HP zt1170 has some problems. I bought it at a refurb computer place and it seemed to be fine there. A couple days later it started to blue-screen when it got bogged down, so I checked into the ram- they claimed it had 256 in it - I found a 128 under the keyboard and n the rear slot a Viking pc100 C01062 - which i believe is 64Mb. After reading the hp repair manual for my laptop, I purchased 512 ram which I put in the slot under the keyboard (I left the viking ram in place). It seemed to start up faster and I managed to install XP from CD - but when I was installing updates from the windows website, it froze. After restarting it a couple times (sometimes I didn't get the boot screen with the HP logo and press F2,F10 etc) I decided to try to reinstall XP by wiping the drive. It got thru the product code and began installation but froze 1/2 way thru 'installing network'. Most of the blue screen errors I have seen are 'IRQL not less or equal' - and the reference numbers are almost always different. The HD is Hitachi 20gig, CDRW/DVD Rom is a Matsushita. I have been trying with no success to get this computer working for a week now. Help would be appreciated.
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A blue screen error usually comes up on Windows 7 when there is a serious hardware or software issue that may be causing Windows to Shut Down unexpectedly. At times, a message may also come up on your screen saying "Windows has been shut down to prevent damage to your computer."
To troubleshoot this issue, you may need to try out multiple troubleshooting options to detect whether the issue is with your hardware or software and to resolve the same as per the recommended procedure.
This sounds like your SATA drive is loosing connection with motherboard connector to the hard drive... seeing that this is a refurb system... maybe the hard drive is not secured to the chassis and causing the errors you are receiving.
try adjusting the brilliance or contrast usually the FN key combined with one of the keys on the top of the keyboard that has a little sun/half sun icon, or It could be the LCD back light that is fainting with time (expensive repare)
I also have a ZT 1170 and it began to do the same thing. It was a bad solder joint in the RAM slot connector in the bottom of the laptop. It would intermittently cause the laptop to hang on bootup, or to randomly lockup.
This laptop has two slots for RAM. One is underneath the laptop behind a small access door, and the other is under the keyboard and requires removal of the keyboard to access it.
To find out if your laptop problem is due to the same issue, open the bottom access panel and remove the bottom RAM memory card. Try booting it up. It should still be able to run, although more slowly due to having less RAM. If it starts up, you are closer to isolating the problem.
In my case, I initially thought I had a defective RAM card, so I purchased another 256Mbyte card for the laptop (mine came with two 256Mb cards), but the new card had the same problem. Then I discovered that pressing down on the RAM card would momentarily fix the problem, which clued me in on it being a bad connection. It seems that heat under the laptop causes some of the solder connections between the memory slot connector and the main PC board to develop hairline cracks. I was able to find the cracked joint and resolder it, but you almost need a microscope to do it. Depending on how much installed memory you need, you could simply leave the one slot empty, and buy a larger RAM card to stick into the other slot (under the keyboard). This laptop can accept a maximum of 512Mbyte card in each slot, for a total of 1024Mbytes.
A blue screen can be caused by hardware or software. First let’s make sure your hardware checks out. Press and hold the <Fn> key while powering the system on. This will initiate a diagnostic routine to check your hardware. If the diags pass, (no errors) then you probably have an operating software issue. Your responses are intended to improve the level of service provided. Please show your appreciation by rating your experience. Thank You.
You have lost your operating system and/ or you hard drive went bad. Try reformatting your hard drive and them reinstalling your operating system. If it reinstalls, try booting up your computer. Turn it off afterwards, wait a bit, then try booting it up again. If it still boots up, then you are good to go. But if it doesn't boot up, or it doesn't boot up after you restart your computer, then your hard drive is bad, and it needs to be replaced. Hope this helps.