I get an error message on startup on my Acer Aspire 5100, it says Realtek RTL8139(x)/8130/810x PCI Fast Ethernet Controller v2.13 (020326) PXE-E61: Media test failure, check cable PXE-M0F: Exiting PXE ROM.

SOURCE: I have a realtek RTL8139{x}/8130/810x PCI FAST

If you use ethernet, then your connection, possibly the cable, is not working.

IF you don't use the ethernet connection, and have no cable plugged in for ethernet, the warning is NORMAL.

SOURCE: Computer does not boot up

Sounds like the computer cannot find your hard drive and is looking for other means to boot the machine. It first is looking for a network hard drive, then it is looking at the DVD. When that fails it is asking you to check the computer for hardware errors. Check to make sure the hard drive is seated in it's compartment. The DV6000 has an adapter that fits on the end of its SATA drive and sometimes that adapter can wiggle loose from the contacts. Just take the hard drive out and then re-seat it to the connector. In most cases it is either a loose connection or the hard drive has suffered a failure.

SOURCE: windows dont come up.

I had this happen to me before with an IBM laptop. I bought a new hard drive, reinstalled a fresh OS, and had no more problems after that. I also went right to ibm website and did all the updates, as well as all the microsoft updates. So my same problem as your ended up being a bad hard drive. maybe check into that?.

SOURCE: PXE-E61 : media test failure, check For Realtek

Are you on a company network ?

As I said if you are, then booting from a network may be part of your company system.

If it is just a home computer then you have other issues which could range from something as simple as a faulty hard drive cable to a dead hard drive.

If it is a company computer on a full lan then turn boot from network back on and see if it will boot. if not then te server that has the boot source may have an error or the lan may have issues.